doing #19407

lib/features/expense/expense_create_page.dart

@@ -55,6 +55,9 @@ class _ExpenseCreatePageState extends ConsumerState<ExpenseCreatePage> {
   bool _refDataLoading = true;
   bool _addingDetail = false;
 
+  // ── 已导入申请单号集合，用于申请事由去重拼接 ──
+  final _importedAeNos = <String>{};
+
   // ── 报销部门 ──
   String _selectedDeptId = '';
   String _selectedDeptName = '';
@@ -434,6 +437,26 @@ class _ExpenseCreatePageState extends ConsumerState<ExpenseCreatePage> {
         for (final aeNo in aeNos) {
           controller.removeDetailsByAeNo(aeNo);
         }
+        // 拼接申请事由到报销单头 purpose（同张单多次转入只拼一次）
+        final newReasons = <String>[];
+        for (final aeNo in aeNos) {
+          if (!_importedAeNos.contains(aeNo)) {
+            final item = result.firstWhere((e) => e.aeNo == aeNo);
+            if (item.reason.isNotEmpty) {
+              newReasons.add(item.reason);
+              _importedAeNos.add(aeNo);
+            }
+          }
+        }
+        if (newReasons.isNotEmpty) {
+          final currentPurpose = controller.currentState.expense.purpose;
+          final joined = newReasons.join('；');
+          final newPurpose = currentPurpose.isNotEmpty
+              ? '$currentPurpose；$joined'
+              : joined;
+          controller.updatePurpose(newPurpose);
+          _purposeController.text = newPurpose;
+        }
         final now = DateTime.now();
         for (final item in result) {
           controller.addDetail(
@@ -1292,8 +1315,7 @@ class _ExpenseCreatePageState extends ConsumerState<ExpenseCreatePage> {
       state.expense.currencyCode.isNotEmpty ||
       _remarkController.text.isNotEmpty ||
       state.expense.details.isNotEmpty ||
-      _attachmentController.files.isNotEmpty ||
-      _selectedDeptId.isNotEmpty;
+      _attachmentController.files.isNotEmpty;
 
   void _doPop() {
     final l10n = AppLocalizations.of(context);

lib/features/expense_apply/expense_apply_create_page.dart

@@ -1085,8 +1085,7 @@ class _ExpenseApplyCreatePageState extends ConsumerState<ExpenseApplyCreatePage>
       _referenceNoController.text.isNotEmpty ||
       _remarkController.text.isNotEmpty ||
       _urgency != Urgency.normal.value ||
-      _validUntil.isNotEmpty ||
-      _selectedDeptId.isNotEmpty;
+      _validUntil.isNotEmpty;
 
   void _clearLocalState() {
     _urgency = Urgency.normal.value;