diff --git a/.gitignore b/.gitignore
index 2fee3eca0..d6f3c6b16 100644
--- a/.gitignore
+++ b/.gitignore
@@ -31,7 +31,7 @@ tdrs-backend/test
 /staticfiles/*
 /mediafiles/*
 __pycache__/
-/.vscode/
+.vscode/
 venv
 *.sqlite3
 *.sqlite3-journal
@@ -108,4 +108,4 @@ tfapply
 cypress.env.json
 
 # Patches
-*.patch
\ No newline at end of file
+*.patch
diff --git a/tdrs-backend/tdpservice/parsers/parse.py b/tdrs-backend/tdpservice/parsers/parse.py
index 9e7af9ce9..b9fd31acf 100644
--- a/tdrs-backend/tdpservice/parsers/parse.py
+++ b/tdrs-backend/tdpservice/parsers/parse.py
@@ -35,8 +35,9 @@ def parse_datafile(datafile):
     field_values = schema_defs.header.get_field_values_by_names(header_line,
                                                                 {"encryption", "tribe_code", "state_fips"})
 
-    # Validate tribe code in submission across program type and fips code
     generate_error = util.make_generate_parser_error(datafile, 1)
+
+    # Validate tribe code in submission across program type and fips code
     tribe_is_valid, tribe_error = validators.validate_tribe_fips_program_agree(header['program_type'],
                                                                                field_values["tribe_code"],
                                                                                field_values["state_fips"],
diff --git a/tdrs-backend/tdpservice/parsers/schema_defs/header.py b/tdrs-backend/tdpservice/parsers/schema_defs/header.py
index a0574ab7b..c28ee5d1e 100644
--- a/tdrs-backend/tdpservice/parsers/schema_defs/header.py
+++ b/tdrs-backend/tdpservice/parsers/schema_defs/header.py
@@ -127,7 +127,7 @@
             startIndex=22,
             endIndex=23,
             required=True,
-            validators=[validators.oneOf(["N", "D", "U"])],
+            validators=[validators.matches("D")],
         ),
     ],
 )
diff --git a/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.FTP1.TS06 b/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.FTP1.TS06
index bb3a1bcca..7c5def7d5 100644
--- a/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.FTP1.TS06
+++ b/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.FTP1.TS06
@@ -1,4 +1,4 @@
-HEADER20204A06   TAN1EN
+HEADER20204A06   TAN1ED
 T12020101111111111223003403361110213120000300000000000008730010000000000000000000000000000000000222222000000002229012                                       
 T2202010111111111121219740114WTTTTTY@W2221222222221012212110014722011400000000000000000000000000000000000000000000000000000000000000000000000000000000000291
 T320201011111111112120190127WTTTT90W022212222204398100000000                                                                                                
diff --git a/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.FTP1.TS142 b/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.FTP1.TS142
index c5de5c6a7..8b2d498b2 100644
--- a/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.FTP1.TS142
+++ b/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.FTP1.TS142
@@ -1,4 +1,4 @@
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+HEADER20214A00142TAN1ED
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 T320211011111111119120100412WTTTTT9ZB212222222 63 11   0   0120140424WTTTTT@0T212222122 63981   0   0                     
diff --git a/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.FTP2.TS06 b/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.FTP2.TS06
index 84171bde8..f57b64f96 100644
--- a/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.FTP2.TS06
+++ b/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.FTP2.TS06
@@ -1,4 +1,4 @@
-HEADER20204C06   TAN1EN
+HEADER20204C06   TAN1ED
 T42020101111111115825301400141123113                                   
 T520201011111111158119970123WTTTTTP@Y2222212222221011212100946200000000
 T520201011111111158120160206WTTTT90TY2222212 2  2 0422981      00000000
diff --git a/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.FTP2.TS142.txt b/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.FTP2.TS142.txt
index f60db47d9..7ef4b46b0 100644
--- a/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.FTP2.TS142.txt
+++ b/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.FTP2.TS142.txt
@@ -1,4 +1,4 @@
-HEADER20194C00142TAN1EU
+HEADER20194C00142TAN1ED
 T420191011111111762255 0402451153123                                   
 T520191011111111762120160102WTTTTT@YB2122222222221 822981  0 03   0   0
 T520191011111111762120170526WTTTTTZPW2122221222221 822981  0 03   0   0
diff --git a/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.FTP3.TS06 b/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.FTP3.TS06
index 8e88b1fb0..319160325 100644
--- a/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.FTP3.TS06
+++ b/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.FTP3.TS06
@@ -1,3 +1,3 @@
-HEADER20204G06   TAN1 N
+HEADER20204G06   TAN1 D
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 TRAILER0000001         
diff --git a/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.FTP3.TS142 b/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.FTP3.TS142
index 6e5798b8a..83dd4d3e9 100644
--- a/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.FTP3.TS142
+++ b/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.FTP3.TS142
@@ -1,3 +1,3 @@
-HEADER20194G00142TAN1EU
+HEADER20194G00142TAN1ED
 T620194       5       1       1       5       1       1       0       0       0       21097       22915       21441      40      41      40       5       6       4       8       9      11      27      26      25      85      89      85      18      21      19      67      68      66       0       0       0       0       0       0       0       0       0       3       3       0
 TRAILER0000001         
diff --git a/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.FTP4.TS06 b/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.FTP4.TS06
index 5c344cf42..f221f53be 100644
--- a/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.FTP4.TS06
+++ b/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.FTP4.TS06
@@ -1,3 +1,3 @@
-HEADER20204S06   TAN1 N
+HEADER20204S06   TAN1 D
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 TRAILER0000001         
\ No newline at end of file
diff --git a/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.NDM1.TS53_fake.rollback.txt b/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.NDM1.TS53_fake.rollback.txt
index e3703414b..b46c46b77 100644
--- a/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.NDM1.TS53_fake.rollback.txt
+++ b/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.NDM1.TS53_fake.rollback.txt
@@ -1,4 +1,4 @@
-HEADER20231A53000TAN1EN                                                                                                                                     
+HEADER20231A53000TAN1ED                                                                                                                                     
 T12023011111111115424200409731120233120000300000000000004170990000000000000000000000000000000000222222000000002229022                                       
 T2202301111111111543219680723WT@BT#ZZZ2222211222222012212110421811069929000000000000000000000000000000000000000000000000000000000000999900000000000000000000
 T320230111111111154120060507WT@9YZ9@@21222222206310100000000                                                                                                
diff --git a/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.NDM1.TS53_fake.txt b/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.NDM1.TS53_fake.txt
index dc3b095e1..4f26f9935 100644
--- a/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.NDM1.TS53_fake.txt
+++ b/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.NDM1.TS53_fake.txt
@@ -1,4 +1,4 @@
-HEADER20231A53000TAN1EN                                                                                                                                     
+HEADER20231A53000TAN1ED                                                                                                                                     
 T12023011111111115424200409731120233120000300000000000004170990000000000000000000000000000000000222222000000002229022                                       
 T2202301111111111543219680723WT@BT#ZZZ2222211222222012212110421811069929000000000000000000000000000000000000000000000000000000000000999900000000000000000000
 T320230111111111154120060507WT@9YZ9@@21222222206310100000000                                                                                                
diff --git a/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.NDM2.MS24 b/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.NDM2.MS24
index 54051bd5d..537afa580 100644
--- a/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.NDM2.MS24
+++ b/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.NDM2.MS24
@@ -1,4 +1,4 @@
-HEADER20184C24   SSP1EU
+HEADER20184C24   SSP1ED
 M42018101111111116120000406911161113                              
 M520181011111111161119791106WTTTY0ZB922212222222210112111112970000
 M520181011111111161120150623WTTTYT#0W222122222222 0422981     0000
diff --git a/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.NDM3.MS24 b/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.NDM3.MS24
index bbe8ee4f0..d1c6d971e 100644
--- a/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.NDM3.MS24
+++ b/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.NDM3.MS24
@@ -1,3 +1,3 @@
-HEADER20184G24   SSP1 N
+HEADER20184G24   SSP1 D
 M620184000158690001600800015956000008610000085100000845000149050001505500015013000001030000010200000098000513550005169600051348000157070001581400015766000356480003588200035582000000000000000000000000000000000000000000000000000000000000000012020000118900001229
 TRAILER0000001         
diff --git a/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.NDM4.MS24 b/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.NDM4.MS24
index 1393729b8..233112f37 100644
--- a/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.NDM4.MS24
+++ b/tdrs-backend/tdpservice/parsers/test/data/ADS.E2J.NDM4.MS24
@@ -1,3 +1,3 @@
-HEADER20184S24   SSP1 N
+HEADER20184S24   SSP1 D
 M720184101000176900013100001111102000074800007670000768103001335200139310014077200000120200011890001229                                                                                                                                                
 TRAILER0000001         
diff --git a/tdrs-backend/tdpservice/parsers/test/data/bad_TANF_S1.txt b/tdrs-backend/tdpservice/parsers/test/data/bad_TANF_S1.txt
index e834d82ff..55fa9eee3 100644
--- a/tdrs-backend/tdpservice/parsers/test/data/bad_TANF_S1.txt
+++ b/tdrs-backend/tdpservice/parsers/test/data/bad_TANF_S1.txt
@@ -1,4 +1,4 @@
-HEADER20214A25   TAN1EU
+HEADER20214A25   TAN1ED
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 T2202110111111111231219810321WTTTBZ9B02212212222221012212110012412011100000000000000000000000000000000000000000000000000000000000000000000000000000000000000
 T320211011111111123520190908WTTTP00TW22222122104398109080000                                                                                                
diff --git a/tdrs-backend/tdpservice/parsers/test/data/bad_TANF_S2.txt b/tdrs-backend/tdpservice/parsers/test/data/bad_TANF_S2.txt
index 8c2a1d9bb..c8b1f791d 100644
--- a/tdrs-backend/tdpservice/parsers/test/data/bad_TANF_S2.txt
+++ b/tdrs-backend/tdpservice/parsers/test/data/bad_TANF_S2.txt
@@ -1,3 +1,3 @@
-HEADER20214A25   TANF1EU
+HEADER20214A25   TANF1ED
 T12021101111111112320303404701120213110305300000000011602530020000000000000000000000000000000000222222000000002229012
 TRAILER0003698
\ No newline at end of file
diff --git a/tdrs-backend/tdpservice/parsers/test/data/bad_trailer_1.txt b/tdrs-backend/tdpservice/parsers/test/data/bad_trailer_1.txt
index 270eb5f20..a36837a5f 100644
--- a/tdrs-backend/tdpservice/parsers/test/data/bad_trailer_1.txt
+++ b/tdrs-backend/tdpservice/parsers/test/data/bad_trailer_1.txt
@@ -1,3 +1,3 @@
-HEADER20204A06   TAN1 N
+HEADER20204A06   TAN1 D
 T1trash
 TRAILERoops
\ No newline at end of file
diff --git a/tdrs-backend/tdpservice/parsers/test/data/bad_trailer_2.txt b/tdrs-backend/tdpservice/parsers/test/data/bad_trailer_2.txt
index 8e3265f77..9060606ce 100644
--- a/tdrs-backend/tdpservice/parsers/test/data/bad_trailer_2.txt
+++ b/tdrs-backend/tdpservice/parsers/test/data/bad_trailer_2.txt
@@ -1,3 +1,3 @@
-HEADER20204A06   TAN1 N
+HEADER20204A06   TAN1 D
 T12020101111111111223003403361110213120000300000000000008730010000000000000000000000000000000000222222000000002229012
 T1trash
\ No newline at end of file
diff --git a/tdrs-backend/tdpservice/parsers/test/data/bad_two_headers.txt b/tdrs-backend/tdpservice/parsers/test/data/bad_two_headers.txt
index 4f0c429ac..809863cfc 100644
--- a/tdrs-backend/tdpservice/parsers/test/data/bad_two_headers.txt
+++ b/tdrs-backend/tdpservice/parsers/test/data/bad_two_headers.txt
@@ -1,4 +1,4 @@
-HEADER20234A25   TAN1EU
+HEADER20234A25   TAN1ED
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 T2202010111111111121219740114WTTTTTY@W2221222222221012212110014722011400000000000000000000000000000000000000000000000000000000000000000000000000000000000291
 T320201011111111112120190127WTTTT90W022212222204398100000000                                                                                                
@@ -6,7 +6,7 @@ T1202313111111111232030340470112021311030530000000001160253002000000000000000000
 T2202313111111111231219810321WTTTBZ9B02212212222221012212110012412011100000000000000000000000000000000000000000000000000000000000000000000000000000000000000
 T320231311111111123520190908WTTTP00TW22222122104398109080000                                                                                                
 TRAILER0003467
-HEADER20223A25   TAN1EU
+HEADER20223A25   TAN1ED
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 T12025101111111114721801401711120212110374300000000000003820060000000000000000000000000000000000222222000000002229012                                               
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diff --git a/tdrs-backend/tdpservice/parsers/test/data/small_bad_ssp_s1.txt b/tdrs-backend/tdpservice/parsers/test/data/small_bad_ssp_s1.txt
index ee8c3c12f..77ea0aa40 100644
--- a/tdrs-backend/tdpservice/parsers/test/data/small_bad_ssp_s1.txt
+++ b/tdrs-backend/tdpservice/parsers/test/data/small_bad_ssp_s1.txt
@@ -1,4 +1,4 @@
-HEADER20184A24   SSP1EU
+HEADER20184A24   SSP1ED
 M1      111111114312120140429105233110741300000000000000010010000000000000000000000000000000000222222000000002229                                     
 M2      111111114311219870621WTTTYPYZ@2222211222221101211112011400000000000000000000000000000000000000000000000000000000000000000000000000000000000000
 M3      11111111431120140515WTTTPY@YW22222112204398100000000                                                                                   
diff --git a/tdrs-backend/tdpservice/parsers/test/data/small_bad_tanf_s1.txt b/tdrs-backend/tdpservice/parsers/test/data/small_bad_tanf_s1.txt
index c7e5c38ea..db468cdee 100644
--- a/tdrs-backend/tdpservice/parsers/test/data/small_bad_tanf_s1.txt
+++ b/tdrs-backend/tdpservice/parsers/test/data/small_bad_tanf_s1.txt
@@ -1,4 +1,4 @@
-HEADER20204A06   TAN1EN
+HEADER20204A06   TAN1ED
 T1      1111111114721801401711120212110374300000000000003820060000000000000000000000000000000000222222000000002229012                                       
 T2      111111111471219800223WTTTT@TTW2222212222221012212110065423010700000000000000000000000000000000000000000000000000000000000000000000000000000000000000
 T3      11111111147120201101WTTTTTZWY22222112204398100000000                                                                                                
diff --git a/tdrs-backend/tdpservice/parsers/test/data/small_correct_file.txt b/tdrs-backend/tdpservice/parsers/test/data/small_correct_file.txt
index 7452a511b..22a45f6d9 100644
--- a/tdrs-backend/tdpservice/parsers/test/data/small_correct_file.txt
+++ b/tdrs-backend/tdpservice/parsers/test/data/small_correct_file.txt
@@ -1,3 +1,3 @@
-HEADER20204A06   TAN1 N
+HEADER20204A06   TAN1 D
 T12020101111111111223003403361110213120000300000000000008730010000000000000000000000000000000000222222000000002229012                                       
 TRAILER0000001         
diff --git a/tdrs-backend/tdpservice/parsers/test/data/small_incorrect_file_cross_validator.txt b/tdrs-backend/tdpservice/parsers/test/data/small_incorrect_file_cross_validator.txt
index f01ab84d1..59133f9a9 100644
--- a/tdrs-backend/tdpservice/parsers/test/data/small_incorrect_file_cross_validator.txt
+++ b/tdrs-backend/tdpservice/parsers/test/data/small_incorrect_file_cross_validator.txt
@@ -1,3 +1,3 @@
-HEADER20204A06   TAN1 N
+HEADER20204A06   TAN1 D
 T12020101111111111223003403361110213120000300000000000008730000000000000000000000000000000000000222222000000002229012                                       
 TRAILER0000001         
\ No newline at end of file
diff --git a/tdrs-backend/tdpservice/parsers/test/data/small_ssp_section1.txt b/tdrs-backend/tdpservice/parsers/test/data/small_ssp_section1.txt
index 2b63873a7..8b86a6db2 100644
--- a/tdrs-backend/tdpservice/parsers/test/data/small_ssp_section1.txt
+++ b/tdrs-backend/tdpservice/parsers/test/data/small_ssp_section1.txt
@@ -1,4 +1,4 @@
-HEADER20234A24   SSP1EU
+HEADER20234A24   SSP1ED
 M1202310111111111272140140035102133110027300000000000000010540000000000000000000000000000000000222222000000002229                                     
 M2202310111111111271219811103WTTT#PW@W2221222222225012211111011935000000000000000000000000000000000000000000000000000000000000225300000000000000000000
 M320231011111111127120110615WTTTP99B#22212222204301100000000                                                                                          
diff --git a/tdrs-backend/tdpservice/parsers/test/data/small_tanf_section1.txt b/tdrs-backend/tdpservice/parsers/test/data/small_tanf_section1.txt
index dc9ddae99..046bbb399 100644
--- a/tdrs-backend/tdpservice/parsers/test/data/small_tanf_section1.txt
+++ b/tdrs-backend/tdpservice/parsers/test/data/small_tanf_section1.txt
@@ -1,4 +1,4 @@
-HEADER20204A06   TAN1EN
+HEADER20204A06   TAN1ED
 T12020101111111111223003403361110213120000300000000000008730010000000000000000000000000000000000222222000000002229012                                       
 T2202010111111111121219740114WTTTTTY@W2221222222221012212110014722011500000000000000000000000000000000000000000000000000000000000000000000000000000000000291
 T320201011111111112120190127WTTTT90W022212222204398100000000                                                                                                
diff --git a/tdrs-backend/tdpservice/parsers/test/data/small_tanf_section2.txt b/tdrs-backend/tdpservice/parsers/test/data/small_tanf_section2.txt
index 7d5613f31..7e25591e0 100644
--- a/tdrs-backend/tdpservice/parsers/test/data/small_tanf_section2.txt
+++ b/tdrs-backend/tdpservice/parsers/test/data/small_tanf_section2.txt
@@ -1,4 +1,4 @@
-HEADER20204C06   TAN1EN
+HEADER20204C06   TAN1ED
 T42020101111111115825301400141123113                                   
 T520201011111111158119970123WTTTTTP@Y2222212222221011212100946200000000
 TRAILER0000828         
diff --git a/tdrs-backend/tdpservice/parsers/test/data/ssp_section1_datafile.txt b/tdrs-backend/tdpservice/parsers/test/data/ssp_section1_datafile.txt
index 4227ae606..6048bf5f4 100644
--- a/tdrs-backend/tdpservice/parsers/test/data/ssp_section1_datafile.txt
+++ b/tdrs-backend/tdpservice/parsers/test/data/ssp_section1_datafile.txt
@@ -1,4 +1,4 @@
-HEADER20184A24   SSP1EU
+HEADER20184A24   SSP1ED
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 M2201810111111111271219811103WTTT#PW@W2221222222225012211111011935000000000000000000000000000000000000000000000000000000000000225300000000000000000000
 M320181011111111127120110615WTTTP99B#22212222204301100000000                                                                                          
diff --git a/tdrs-backend/tdpservice/parsers/test/data/tanf_s1_bad_update_indicator.txt b/tdrs-backend/tdpservice/parsers/test/data/tanf_s1_bad_update_indicator.txt
new file mode 100644
index 000000000..47c1590a0
--- /dev/null
+++ b/tdrs-backend/tdpservice/parsers/test/data/tanf_s1_bad_update_indicator.txt
@@ -0,0 +1,3 @@
+HEADER20204A06   TAN1 U
+T12020101111111111223003403361110213120000300000000000008730010000000000000000000000000000000000222222000000002229012                                       
+TRAILER0000001         
diff --git a/tdrs-backend/tdpservice/parsers/test/data/tanf_section1_blanks.txt b/tdrs-backend/tdpservice/parsers/test/data/tanf_section1_blanks.txt
index c9f313404..f386b8f71 100644
--- a/tdrs-backend/tdpservice/parsers/test/data/tanf_section1_blanks.txt
+++ b/tdrs-backend/tdpservice/parsers/test/data/tanf_section1_blanks.txt
@@ -1,4 +1,4 @@
-HEADER20204A06   TAN1EN
+HEADER20204A06   TAN1ED
 T120201011111111112230  4033611102131 0000 00000000000008730010000000000000000              00002 222200000000222901                                        
 T2202010111111111121219740114WTTTTTY@W      2221 1 01             01                                                               0000     0000000000000291
 T320201011111111112120190127WTTTT90W0      222   98 00000000                                                                                                
diff --git a/tdrs-backend/tdpservice/parsers/test/data/tanf_section1_header_test.txt b/tdrs-backend/tdpservice/parsers/test/data/tanf_section1_header_test.txt
index 7452a511b..22a45f6d9 100644
--- a/tdrs-backend/tdpservice/parsers/test/data/tanf_section1_header_test.txt
+++ b/tdrs-backend/tdpservice/parsers/test/data/tanf_section1_header_test.txt
@@ -1,3 +1,3 @@
-HEADER20204A06   TAN1 N
+HEADER20204A06   TAN1 D
 T12020101111111111223003403361110213120000300000000000008730010000000000000000000000000000000000222222000000002229012                                       
 TRAILER0000001         
diff --git a/tdrs-backend/tdpservice/parsers/test/data/tanf_section4_with_errors.txt b/tdrs-backend/tdpservice/parsers/test/data/tanf_section4_with_errors.txt
index 53590eccf..fbfc37fe8 100644
--- a/tdrs-backend/tdpservice/parsers/test/data/tanf_section4_with_errors.txt
+++ b/tdrs-backend/tdpservice/parsers/test/data/tanf_section4_with_errors.txt
@@ -1,3 +1,3 @@
-HEADER20204S06   TAN1 N
+HEADER20204S06   TAN1 D
 T720204700006853700680540068454103000312400000000003180104000347400036460003583106000044600004360000325299000506200036070003385202000039100002740000499                                                                                                
 TRAILER0000001         
\ No newline at end of file
diff --git a/tdrs-backend/tdpservice/parsers/test/data/tribal_section_1_inconsistency.txt b/tdrs-backend/tdpservice/parsers/test/data/tribal_section_1_inconsistency.txt
index c50875aa1..0b219728c 100644
--- a/tdrs-backend/tdpservice/parsers/test/data/tribal_section_1_inconsistency.txt
+++ b/tdrs-backend/tdpservice/parsers/test/data/tribal_section_1_inconsistency.txt
@@ -1,3 +1,3 @@
-HEADER20194A01142TAN1EU
+HEADER20194A01142TAN1ED
 T120191011111111119255 140245112 23322   03   0   0   0 502  9   0 0  0   0  0   0  0   0  3   0222222   0   0222  12      
 TRAILER0000001         
diff --git a/tdrs-backend/tdpservice/parsers/test/data/tribal_section_4_fake.txt b/tdrs-backend/tdpservice/parsers/test/data/tribal_section_4_fake.txt
index 904d0bb79..4bc7f65af 100644
--- a/tdrs-backend/tdpservice/parsers/test/data/tribal_section_4_fake.txt
+++ b/tdrs-backend/tdpservice/parsers/test/data/tribal_section_4_fake.txt
@@ -1,3 +1,3 @@
-HEADER20194S00142TAN1EU
+HEADER20194S00142TAN1ED
 T720204101006853700680540068454103000312400037850003180104000347400036460003583106000044600004360000325299000506200036070003385202000039100002740000499                                                                                                
 TRAILER0000001         
\ No newline at end of file
diff --git a/tdrs-backend/tdpservice/parsers/test/test_parse.py b/tdrs-backend/tdpservice/parsers/test/test_parse.py
index 2aaabcc19..0660f678a 100644
--- a/tdrs-backend/tdpservice/parsers/test/test_parse.py
+++ b/tdrs-backend/tdpservice/parsers/test/test_parse.py
@@ -47,7 +47,7 @@ def t2_invalid_dob_file():
         quarter='Q2',
         file__name='t2_invalid_dob_file.txt',
         file__section='Active Case Data',
-        file__data=(b'HEADER20211A25   TAN1EU\n'
+        file__data=(b'HEADER20211A25   TAN1ED\n'
                     b'T22020101111111111212Q897$9 3WTTTTTY@W222122222222101221211001472201140000000000000000000000000'
                     b'0000000000000000000000000000000000000000000000000000000000291\n'
                     b'TRAILER0000001         ')
@@ -1489,3 +1489,24 @@ def test_parse_tanf_section4_file_with_errors(tanf_section_4_file_with_errors, d
 
     assert first.FAMILIES_MONTH == 0
     assert sixth.FAMILIES_MONTH == 446
+
+@pytest.fixture
+def tanf_section_1_file_with_bad_update_indicator(stt_user, stt):
+    """Fixture for tanf_section_1_file_with_bad_update_indicator."""
+    return util.create_test_datafile('tanf_s1_bad_update_indicator.txt', stt_user, stt, "Active Case Data")
+
+@pytest.mark.django_db()
+def test_parse_tanf_section_1_file_with_bad_update_indicator(tanf_section_1_file_with_bad_update_indicator, dfs):
+    """Test parsing TANF Section 1 submission update indicator."""
+    dfs.datafile = tanf_section_1_file_with_bad_update_indicator
+
+    parse.parse_datafile(tanf_section_1_file_with_bad_update_indicator)
+
+    parser_errors = ParserError.objects.filter(file=tanf_section_1_file_with_bad_update_indicator)
+
+    assert parser_errors.count() == 1
+
+    error = parser_errors.first()
+
+    assert error.error_type == ParserErrorCategoryChoices.FIELD_VALUE
+    assert error.error_message == "U does not match D."
diff --git a/tdrs-backend/tdpservice/parsers/test/test_validators.py b/tdrs-backend/tdpservice/parsers/test/test_validators.py
index 7d6a6011a..2004eafdb 100644
--- a/tdrs-backend/tdpservice/parsers/test/test_validators.py
+++ b/tdrs-backend/tdpservice/parsers/test/test_validators.py
@@ -6,7 +6,6 @@
 from tdpservice.parsers.test.factories import TanfT1Factory, TanfT2Factory, TanfT3Factory, TanfT5Factory, TanfT6Factory
 from tdpservice.parsers.test.factories import SSPM5Factory
 
-
 @pytest.mark.parametrize("value,length", [
     (None, 0),
     (None, 10),
@@ -20,7 +19,6 @@ def test_value_is_empty_returns_true(value, length):
     result = validators.value_is_empty(value, length)
     assert result is True
 
-
 @pytest.mark.parametrize("value,length", [
     (0, 1),
     (1, 1),
@@ -449,6 +447,7 @@ def test_notEmpty_returns_nonexistent_substring():
     assert is_valid is False
     assert error == "111  333 contains blanks between positions 10 and 12."
 
+
 @pytest.mark.usefixtures('db')
 class TestCat3ValidatorsBase:
     """A base test class for tests that evaluate category three validators."""