Fix issue

Author: ZhenjaHorbach

src/components/MoneyReportHeader.tsx

@@ -844,7 +844,7 @@ function MoneyReportHeader({
                 }
 
                 const currentTransaction = transactions.at(0);
-                initSplitExpense(currentTransaction, moneyRequestReport?.reportID ?? String(CONST.DEFAULT_NUMBER_ID));
+                initSplitExpense(currentTransaction);
             },
         },
         [CONST.REPORT.SECONDARY_ACTIONS.CHANGE_WORKSPACE]: {

src/components/MoneyRequestHeader.tsx

@@ -240,7 +240,7 @@ function MoneyRequestHeader({report, parentReportAction, policy, onBackButtonPre
             icon: Expensicons.ArrowSplit,
             value: CONST.REPORT.SECONDARY_ACTIONS.SPLIT,
             onSelected: () => {
-                initSplitExpense(transaction, reportID ?? String(CONST.DEFAULT_NUMBER_ID));
+                initSplitExpense(transaction);
             },
         },
         [CONST.REPORT.TRANSACTION_SECONDARY_ACTIONS.VIEW_DETAILS]: {

src/libs/actions/IOU.ts

@@ -11661,11 +11661,13 @@ function getSearchOnyxUpdate({
 /**
  * Create a draft transaction to set up split expense details for the split expense flow
  */
-function initSplitExpense(transaction: OnyxEntry<OnyxTypes.Transaction>, reportID: string, isOpenCreatedSplit?: boolean) {
+function initSplitExpense(transaction: OnyxEntry<OnyxTypes.Transaction>, isOpenCreatedSplit?: boolean) {
     if (!transaction) {
         return;
     }
 
+    const reportID = transaction?.reportID ?? String(CONST.DEFAULT_NUMBER_ID);
+
     if (isOpenCreatedSplit) {
         const originalTransactionID = transaction.comment?.originalTransactionID;
         const originalTransaction = allTransactions[`${ONYXKEYS.COLLECTION.TRANSACTION}${originalTransactionID}`];

tests/actions/IOUTest.ts

@@ -6074,7 +6074,7 @@ describe('actions/IOU', () => {
 
             const reportID = '456';
 
-            initSplitExpense(transaction, reportID);
+            initSplitExpense(transaction);
             await waitForBatchedUpdates();
 
             const draftTransaction = await getOnyxValue(`${ONYXKEYS.COLLECTION.SPLIT_TRANSACTION_DRAFT}${transaction.transactionID}`);
@@ -6100,9 +6100,8 @@ describe('actions/IOU', () => {
         });
         it('should not initialize split expense for null transaction', async () => {
             const transaction: Transaction | undefined = undefined;
-            const reportID = '456';
 
-            initSplitExpense(transaction, reportID);
+            initSplitExpense(transaction);
             await waitForBatchedUpdates();
 
             expect(transaction).toBeFalsy();