Fix crash when editing parent transaction amount

packages/desktop-client/src/components/transactions/TransactionsTable.jsx

@@ -689,6 +689,7 @@ function PayeeIcons({
 const Transaction = memo(function Transaction(props) {
   const {
     transaction: originalTransaction,
+    subtransactions,
     editing,
     showAccount,
     showBalance,
@@ -827,6 +828,8 @@ const Transaction = memo(function Transaction(props) {
       // Run the transaction through the formatting so that we know
       // it's always showing the formatted result
       setTransaction(serializeTransaction(deserialized, showZeroInDeposit));
+
+      deserialized.subtransactions = subtransactions;
       onSave(deserialized);
     }
   }
@@ -1473,9 +1476,10 @@ function NewTransaction({
   const error = transactions[0].error;
   const isDeposit = transactions[0].amount > 0;
 
-  const emptyChildTransactions = transactions.filter(
-    t => t.parent_id === transactions[0].id && t.amount === 0,
+  const childTransactions = transactions.filter(
+    t => t.parent_id === transactions[0].id,
   );
+  const emptyChildTransactions = childTransactions.filter(t => t.amount === 0);
 
   return (
     <View
@@ -1497,6 +1501,7 @@ function NewTransaction({
           key={transaction.id}
           editing={editingTransaction === transaction.id}
           transaction={transaction}
+          subtransactions={childTransactions.length ? childTransactions : null}
           showAccount={showAccount}
           showCategory={showCategory}
           showBalance={showBalance}

packages/loot-core/src/server/accounts/rules.ts

@@ -16,6 +16,7 @@ import {
   addSplitTransaction,
   recalculateSplit,
   splitTransaction,
+  ungroupTransaction,
 } from '../../shared/transactions';
 import { fastSetMerge } from '../../shared/util';
 import { RuleConditionEntity } from '../../types/models';
@@ -541,7 +542,10 @@ export function execActions(actions: Action[], transaction) {
     return transaction;
   }
 
-  const { data, newTransaction } = splitTransaction([update], transaction.id);
+  const { data, newTransaction } = splitTransaction(
+    ungroupTransaction(update),
+    transaction.id,
+  );
   update = recalculateSplit(newTransaction);
   data[0] = update;
   let newTransactions = data;