fix: [Dupe detection] Tax field does not show the "Default" label on the confirmation page

src/components/ReportActionItem/MoneyRequestPreview/MoneyRequestPreviewContent.tsx

@@ -298,7 +298,11 @@ function MoneyRequestPreviewContent({
         // Clear the draft before selecting a different expense to prevent merging fields from the previous expense
         // (e.g., category, tag, tax) that may be not enabled/available in the new expense's policy.
         Transaction.abandonReviewDuplicateTransactions();
-        const comparisonResult = TransactionUtils.compareDuplicateTransactionFields(reviewingTransactionID, transaction?.reportID ?? '');
+        const comparisonResult = TransactionUtils.compareDuplicateTransactionFields(
+            reviewingTransactionID,
+            transaction?.reportID ?? '',
+            transaction?.transactionID ?? reviewingTransactionID,
+        );
         Transaction.setReviewDuplicatesKey({...comparisonResult.keep, duplicates, transactionID: transaction?.transactionID ?? '', reportID: transaction?.reportID});
 
         if ('merchant' in comparisonResult.change) {

src/libs/TransactionUtils/index.ts

@@ -1043,10 +1043,10 @@ function removeSettledAndApprovedTransactions(transactionIDs: string[]) {
  * 6. It returns the 'keep' and 'change' objects.
  */
 
-function compareDuplicateTransactionFields(transactionID: string, reportID: string): {keep: Partial<ReviewDuplicates>; change: FieldsToChange} {
-    const transactionViolations = allTransactionViolations?.[`${ONYXKEYS.COLLECTION.TRANSACTION_VIOLATIONS}${transactionID}`];
+function compareDuplicateTransactionFields(reviewingTransactionID: string, reportID: string, selectedTransactionID?: string): {keep: Partial<ReviewDuplicates>; change: FieldsToChange} {
+    const transactionViolations = allTransactionViolations?.[`${ONYXKEYS.COLLECTION.TRANSACTION_VIOLATIONS}${reviewingTransactionID}`];
     const duplicates = transactionViolations?.find((violation) => violation.name === CONST.VIOLATIONS.DUPLICATED_TRANSACTION)?.data?.duplicates ?? [];
-    const transactions = removeSettledAndApprovedTransactions([transactionID, ...duplicates]).map((item) => getTransaction(item));
+    const transactions = removeSettledAndApprovedTransactions([reviewingTransactionID, ...duplicates]).map((item) => getTransaction(item));
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
     const keep: Record<string, any> = {};
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
@@ -1099,6 +1099,14 @@ function compareDuplicateTransactionFields(transactionID: string, reportID: stri
         }
     }
 
+    // The comment object needs to be stored only when selecting a specific transaction to keep.
+    // It contains details such as 'customUnit' and 'waypoints,' which remain unchanged during the review steps
+    // but are essential for displaying complete information on the confirmation page.
+    if (selectedTransactionID) {
+        const selectedTransaction = transactions.find((t) => t?.transactionID === selectedTransactionID);
+        keep.comment = selectedTransaction?.comment ?? {};
+    }
+
     for (const fieldName in fieldsToCompare) {
         if (Object.prototype.hasOwnProperty.call(fieldsToCompare, fieldName)) {
             const keys = fieldsToCompare[fieldName];
@@ -1195,7 +1203,7 @@ function buildNewTransactionAfterReviewingDuplicates(reviewDuplicateTransaction:
         ...restReviewDuplicateTransaction,
         modifiedMerchant: reviewDuplicateTransaction?.merchant,
         merchant: reviewDuplicateTransaction?.merchant,
-        comment: {comment: reviewDuplicateTransaction?.description},
+        comment: {...reviewDuplicateTransaction?.comment, comment: reviewDuplicateTransaction?.description},
     };
 }
 

src/types/onyx/ReviewDuplicates.ts

@@ -1,3 +1,5 @@
+import type {Comment} from './Transaction';
+
 /**
  * Model of review duplicates request
  */
@@ -29,6 +31,9 @@ type ReviewDuplicates = {
     /** Description  which user want to keep */
     description: string;
 
+    /** NVPs of the transaction that we want to keep */
+    comment: Comment;
+
     /** Whether the transaction is reimbursable */
     reimbursable: boolean;