diff --git a/src/pages/09_task-order/order_view/MainPage.vue b/src/pages/09_task-order/order_view/MainPage.vue
index 6ffd5ade..f5287f53 100644
--- a/src/pages/09_task-order/order_view/MainPage.vue
+++ b/src/pages/09_task-order/order_view/MainPage.vue
@@ -15,7 +15,12 @@ import AdditionalFileExpansion from '../expansion/AdditionalFileExpansion.vue';
 import RemarkExpansion from '../expansion/RemarkExpansion.vue';
 import InfoMessengerExpansion from '../expansion/receive/InfoMessengerExpansion.vue';
 import TableEmployee from '../TableEmployee.vue';
-import { SaveButton, MainButton, EditButton } from 'src/components/button';
+import {
+  SaveButton,
+  MainButton,
+  EditButton,
+  UndoButton,
+} from 'src/components/button';
 import FormGroupHead from 'src/pages/08_request-list/FormGroupHead.vue';
 import FailRemarkDialog from '../receive_view/FailRemarkDialog.vue';
 
@@ -412,6 +417,26 @@ function openProductDialog() {
   pageState.productDialog = true;
 }
 
+async function closeTab() {
+  if (state.value.mode === 'edit' && !!currentFormData.value.id) {
+    taskOrderFormStore.resetForm();
+    await taskOrderFormStore.assignFormData(currentFormData.value.id, 'edit');
+  } else {
+    dialogWarningClose(t, {
+      message: t('dialog.message.close'),
+      action: () => {
+        window.close();
+      },
+      cancel: () => {},
+    });
+  }
+}
+
+function undo() {
+  if (!currentFormData.value) return;
+  taskOrderFormStore.assignFormData(currentFormData.value?.id || '', 'info');
+}
+
 onMounted(async () => {
   initTheme();
   initLang();
@@ -1124,13 +1149,18 @@ watch([currentFormData.value.taskStatus], () => {
           {{ $t('general.view', { msg: $t('general.example') }) }}
         </MainButton>
         <div class="row" style="gap: var(--size-2)">
-          <template v-if="state.mode === 'create'">
-            <!-- <UndoButton outlined @click="undo()" v-if="state.mode === 'edit'" />
+          <template
+            v-if="
+              fullTaskOrder?.taskOrderStatus === TaskOrderStatus.Pending ||
+              state.mode === 'create'
+            "
+          >
+            <UndoButton outlined @click="undo()" v-if="state.mode === 'edit'" />
             <CancelButton
               @click="closeTab()"
               v-if="state.mode === 'info'"
               outlined
-            /> -->
+            />
             <SaveButton
               v-if="state.mode && ['create', 'edit'].includes(state.mode)"
               @click="() => formDocument.submit()"