diff --git a/documentation/IDTA-01002-3/modules/ROOT/pages/IDTA-01002_HTTP-REST-API.adoc b/documentation/IDTA-01002-3/modules/ROOT/pages/IDTA-01002_HTTP-REST-API.adoc
index 86ba0c68..98140eaf 100644
--- a/documentation/IDTA-01002-3/modules/ROOT/pages/IDTA-01002_HTTP-REST-API.adoc
+++ b/documentation/IDTA-01002-3/modules/ROOT/pages/IDTA-01002_HTTP-REST-API.adoc
@@ -322,6 +322,8 @@ use separated idshort path of this element
 path-suffix= $metadata/$value/$reference/$path or no suffix for nomal +
 ?extent=WithoutBLOBValue/WithBLOBValue
 
+*Note:* If a client uses a path-suffix for a SubmodelElement that has the associated Serialisation Modifier not defined (e.g. .../capabilityIdShort/$value), a server shall respond with a ClientErrorBadRequest (HTTP status code 400) and an appropriate error description in the response message.
+
 URL-encoded IdShortPath
 
 |GetFileByPath |GET |/submodel/submodel-elements/\{idShortPath}/attachment a|