diff --git a/client/src/components/reservation/ReservationV4TraceCard.vue b/client/src/components/reservation/ReservationV4TraceCard.vue
index 3a21522..32a0dba 100644
--- a/client/src/components/reservation/ReservationV4TraceCard.vue
+++ b/client/src/components/reservation/ReservationV4TraceCard.vue
@@ -29,7 +29,7 @@
           :class="{ 'trace-field--readonly': !isEditable(field) }"
         >
           <span class="trace-field__label">
-            {{ field.display_name }}
+            {{ traceFieldLabel(field) }}
             <sup v-if="field.required">*</sup>
           </span>
 
@@ -387,6 +387,23 @@ function fieldPointer(field: ReservationV4TaskCardFieldResult): string {
   return field.field_pointer || fieldPathToPointer(field.field_path)
 }
 
+function traceFieldLabel(field: ReservationV4TaskCardFieldResult): string {
+  const pointer = fieldPointer(field)
+  if (pointer.endsWith('/text')) {
+    return t('taskV4.trace.textLabel')
+  }
+  if (pointer.endsWith('/department_code')) {
+    return t('taskV4.trace.department')
+  }
+  if (pointer.endsWith('/target_room_type_code')) {
+    return t('taskV4.trace.targetRoomType')
+  }
+  if (pointer.endsWith('/extra_bed_room_count')) {
+    return t('taskV4.trace.extraBedRoomCount')
+  }
+  return field.display_name || fieldKey(field)
+}
+
 function lookupItemLabel(item: ReservationV4CatalogLookupItem): string {
   if (item.display_name && item.display_name !== item.code) {
     return `${item.code} - ${item.display_name}`
diff --git a/client/src/i18n/locales/en-US.ts b/client/src/i18n/locales/en-US.ts
index 9b34771..4d81c00 100644
--- a/client/src/i18n/locales/en-US.ts
+++ b/client/src/i18n/locales/en-US.ts
@@ -628,6 +628,10 @@ export default {
     cardConfirmed: 'Card confirmed and detail refreshed.',
     reviewResolved: 'Review submitted and detail refreshed.',
     validationFailed: 'Fix current-card field errors first.',
+    fieldValidation: {
+      required: '{field} is required',
+      positiveInteger: '{field} must be an integer greater than 0',
+    },
     fieldLabels: {
       basicInformation: {
         accountCode: 'Account Code',
@@ -692,6 +696,10 @@ export default {
       generalTitle: 'General note',
       extraBedTitle: 'Extra bed note',
       action: 'Fixed action',
+      textLabel: 'Follow-up note',
+      department: 'Department',
+      targetRoomType: 'Target room type',
+      extraBedRoomCount: 'Extra bed room count',
     },
     lookup: {
       loading: 'Loading options',
diff --git a/client/src/i18n/locales/th-TH.ts b/client/src/i18n/locales/th-TH.ts
index 5051fde..765fd5a 100644
--- a/client/src/i18n/locales/th-TH.ts
+++ b/client/src/i18n/locales/th-TH.ts
@@ -628,6 +628,10 @@ export default {
     cardConfirmed: 'ยืนยันการ์ดแล้วและรีเฟรชรายละเอียดแล้ว',
     reviewResolved: 'ส่งผลตรวจสอบแล้วและรีเฟรชรายละเอียดแล้ว',
     validationFailed: 'โปรดแก้ไขข้อมูลในการ์ดปัจจุบันก่อน',
+    fieldValidation: {
+      required: 'จำเป็นต้องกรอก {field}',
+      positiveInteger: '{field} ต้องเป็นจำนวนเต็มมากกว่า 0',
+    },
     fieldLabels: {
       basicInformation: {
         accountCode: 'รหัสบัญชี',
@@ -692,6 +696,10 @@ export default {
       generalTitle: 'หมายเหตุทั่วไป',
       extraBedTitle: 'รายการเตียงเสริม',
       action: 'การดำเนินการคงที่',
+      textLabel: 'รายละเอียดติดตาม',
+      department: 'แผนกที่รับผิดชอบ',
+      targetRoomType: 'ประเภทห้องเป้าหมาย',
+      extraBedRoomCount: 'จำนวนห้องที่เพิ่มเตียง',
     },
     lookup: {
       loading: 'กำลังโหลดตัวเลือก',
diff --git a/client/src/i18n/locales/zh-CN.ts b/client/src/i18n/locales/zh-CN.ts
index b6e29ff..b4c1d55 100644
--- a/client/src/i18n/locales/zh-CN.ts
+++ b/client/src/i18n/locales/zh-CN.ts
@@ -627,6 +627,10 @@ export default {
     cardConfirmed: '卡片已确认，详情已刷新。',
     reviewResolved: '复核已提交，详情已刷新。',
     validationFailed: '请先修正当前卡片字段。',
+    fieldValidation: {
+      required: '{field}为必填项',
+      positiveInteger: '{field}必须是大于 0 的整数',
+    },
     fieldLabels: {
       basicInformation: {
         accountCode: '客户代码',
@@ -691,6 +695,10 @@ export default {
       generalTitle: '普通事项',
       extraBedTitle: '加床事项',
       action: '固定动作',
+      textLabel: '跟进内容',
+      department: '处理部门',
+      targetRoomType: '目标房型',
+      extraBedRoomCount: '加床房间数',
     },
     lookup: {
       loading: '选项加载中',
diff --git a/client/src/tests/reservationV4Views.spec.ts b/client/src/tests/reservationV4Views.spec.ts
index 129707f..1dbb086 100644
--- a/client/src/tests/reservationV4Views.spec.ts
+++ b/client/src/tests/reservationV4Views.spec.ts
@@ -662,6 +662,10 @@ describe('reservation V4 pages', () => {
       .findAll('.task-card-section')
       .find((section) => section.find('[data-testid="trace-card"]').exists())
     expect(traceSection).toBeTruthy()
+    expect(traceSection!.text()).toContain(zhCN.taskV4.trace.textLabel)
+    expect(traceSection!.text()).toContain(zhCN.taskV4.trace.department)
+    expect(traceSection!.text()).not.toContain('Trace 内容')
+    expect(traceSection!.text()).not.toContain('Department Code')
     expect((traceSection!.find('textarea[name="/trace_items/0/text"]').element as HTMLTextAreaElement).value)
       .toBe('Late arrival note')
     expect(traceSection!.text()).not.toContain('CONTENT_SHOULD_NOT_RENDER')
@@ -716,6 +720,12 @@ describe('reservation V4 pages', () => {
       .find((section) => section.find('[data-testid="trace-card"]').exists())
     expect(traceSection).toBeTruthy()
     expect(traceSection!.text()).toContain('SET EXTRA BED')
+    expect(traceSection!.text()).toContain(zhCN.taskV4.trace.targetRoomType)
+    expect(traceSection!.text()).toContain(zhCN.taskV4.trace.extraBedRoomCount)
+    expect(traceSection!.text()).toContain(zhCN.taskV4.trace.department)
+    expect(traceSection!.text()).not.toContain('Target Room Type Code')
+    expect(traceSection!.text()).not.toContain('Extra Bed Room Count')
+    expect(traceSection!.text()).not.toContain('Department Code')
     expect(traceSection!.find('select[name="/trace_items/0/target_room_type_code"]').text()).toContain('RM2')
     const roomCountInput = traceSection!.find('input[name="/trace_items/0/extra_bed_room_count"]')
     expect(roomCountInput.attributes('type')).toBe('number')
@@ -729,7 +739,10 @@ describe('reservation V4 pages', () => {
     await flushPromises()
 
     expect(service.confirmReservationV4OrderTaskCard).not.toHaveBeenCalled()
-    expect(traceSection!.text()).toContain('Extra Bed Room Count must be a positive integer')
+    expect(traceSection!.text()).toContain(
+      zhCN.taskV4.fieldValidation.positiveInteger.replace('{field}', zhCN.taskV4.trace.extraBedRoomCount),
+    )
+    expect(traceSection!.text()).not.toContain('Extra Bed Room Count must be a positive integer')
 
     await roomCountInput.setValue('2')
     await traceSection!.find('button.primary-button').trigger('click')
@@ -2045,7 +2058,7 @@ function useTraceBusinessCard(
       fields: itemType === 'EXTRA_BED'
         ? [
             createField('/trace_items/0/target_room_type_code', {
-              display_name: 'Target Room Type',
+              display_name: 'Target Room Type Code',
               value: 'RM2',
               options_source: 'RESERVATION_V4_ROOM_TYPE_CATALOG',
               control_type: 'SELECT',
@@ -2070,7 +2083,7 @@ function useTraceBusinessCard(
           ]
         : [
             createField('/trace_items/0/text', {
-              display_name: 'Trace Text',
+              display_name: 'Trace 内容',
               value: 'Late arrival note',
               control_type: 'TEXTAREA',
               edit_scope: isReviewRequired ? 'REVIEW' : 'CONFIRM',
@@ -2099,7 +2112,7 @@ function createTraceDepartmentField(
   validationErrors: string[] = [],
 ): ReservationV4TaskCardResult['fields'][number] {
   return createField('/trace_items/0/department_code', {
-    display_name: 'Department',
+    display_name: 'Department Code',
     value: 'FO',
     control_type: 'SELECT',
     options_source: 'reservation_v4_trace_department_fixed',
diff --git a/client/src/utils/reservationV4FieldRules.ts b/client/src/utils/reservationV4FieldRules.ts
index 93d0ebc..a8e4be8 100644
--- a/client/src/utils/reservationV4FieldRules.ts
+++ b/client/src/utils/reservationV4FieldRules.ts
@@ -30,6 +30,15 @@ const hiddenDisplayValue = Symbol('reservation-v4-hidden-display-value')
 
 export type ReservationV4FieldErrorMap = Record<string, string>
 export type ReservationV4LookupKind = 'ACCOUNT' | 'ROOM_TYPE' | 'RATE_CODE'
+export type ReservationV4FieldValidationErrorType = 'required' | 'positiveInteger'
+export type ReservationV4FieldValidationMessageContext = {
+  type: ReservationV4FieldValidationErrorType
+  field: ReservationV4TaskCardFieldResult
+  fieldKey: string
+}
+export type ReservationV4FieldValidationOptions = {
+  formatMessage?: (context: ReservationV4FieldValidationMessageContext) => string
+}
 
 export function reservationV4FieldKey(field: ReservationV4TaskCardFieldResult): string {
   return field.field_pointer || field.field_path
@@ -81,21 +90,42 @@ export function buildReservationV4ReviewOverrides(
 export function validateReservationV4Fields(
   fields: ReservationV4TaskCardFieldResult[],
   values: ReservationRecord,
+  options: ReservationV4FieldValidationOptions = {},
 ): ReservationV4FieldErrorMap {
   return fields.filter(isReservationV4EditableField).reduce<ReservationV4FieldErrorMap>((errors, field) => {
     const key = reservationV4FieldKey(field)
     const value = readV4FieldValue(field, values)
     if (field.required && isEmptyV4Value(value)) {
-      errors[key] = `${field.display_name} is required`
+      errors[key] = formatValidationMessage('required', field, key, options)
       return errors
     }
     if (isTracePositiveIntegerField(field) && !isEmptyV4Value(value) && !isPositiveIntegerValue(value)) {
-      errors[key] = `${field.display_name} must be a positive integer`
+      errors[key] = formatValidationMessage('positiveInteger', field, key, options)
     }
     return errors
   }, {})
 }
 
+function formatValidationMessage(
+  type: ReservationV4FieldValidationErrorType,
+  field: ReservationV4TaskCardFieldResult,
+  fieldKey: string,
+  options: ReservationV4FieldValidationOptions,
+): string {
+  const formattedMessage = options.formatMessage?.({
+    type,
+    field,
+    fieldKey,
+  })
+  if (formattedMessage?.trim()) {
+    return formattedMessage
+  }
+  if (type === 'positiveInteger') {
+    return `${field.display_name} must be a positive integer`
+  }
+  return `${field.display_name} is required`
+}
+
 export function isReservationV4ConfirmWritableField(field: ReservationV4TaskCardFieldResult): boolean {
   if (!isReservationV4EditableField(field)) {
     return false
diff --git a/client/src/views/reservation/ReservationV4OrderTaskDetailView.vue b/client/src/views/reservation/ReservationV4OrderTaskDetailView.vue
index 772d8c5..6fffa13 100644
--- a/client/src/views/reservation/ReservationV4OrderTaskDetailView.vue
+++ b/client/src/views/reservation/ReservationV4OrderTaskDetailView.vue
@@ -195,6 +195,7 @@ import type {
   ReservationRecord,
   ReservationV4OrderTaskDetailResult,
   ReservationV4TaskCardResult,
+  ReservationV4TaskCardFieldResult,
 } from '@/types/reservation'
 import {
   formatReservationTaskCard,
@@ -209,7 +210,9 @@ import {
   isReservationV4ReviewWritableField,
   isReservationV4TraceSafeField,
   mapReservationV4BackendDetailsToFields,
+  fieldPathToPointer,
   reservationV4FieldKey,
+  type ReservationV4FieldValidationMessageContext,
   validateReservationV4Fields,
 } from '@/utils/reservationV4FieldRules'
 
@@ -405,7 +408,11 @@ function canReviewCard(card: ReservationV4TaskCardResult): boolean {
 async function submitConfirm(card: ReservationV4TaskCardResult): Promise<void> {
   const submissionFields = submissionFieldsForCard(card)
   const writableFields = submissionFields.filter(isReservationV4ConfirmWritableField)
-  const localErrors = validateReservationV4Fields(writableFields, cardValues.value[card.card_id] ?? {})
+  const localErrors = validateReservationV4Fields(
+    writableFields,
+    cardValues.value[card.card_id] ?? {},
+    { formatMessage: (context) => formatLocalFieldValidationMessage(card, context) },
+  )
   cardFieldErrors.value = {
     ...cardFieldErrors.value,
     [card.card_id]: localErrors,
@@ -458,7 +465,11 @@ async function submitReview(card: ReservationV4TaskCardResult): Promise<void> {
 
   const submissionFields = submissionFieldsForCard(card)
   const writableFields = submissionFields.filter(isReservationV4ReviewWritableField)
-  const localErrors = validateReservationV4Fields(writableFields, cardValues.value[card.card_id] ?? {})
+  const localErrors = validateReservationV4Fields(
+    writableFields,
+    cardValues.value[card.card_id] ?? {},
+    { formatMessage: (context) => formatLocalFieldValidationMessage(card, context) },
+  )
   cardFieldErrors.value = {
     ...cardFieldErrors.value,
     [card.card_id]: localErrors,
@@ -610,6 +621,39 @@ function cardTitle(card: ReservationV4TaskCardResult): string {
   return formatReservationTaskCard(t, card.card_type)
 }
 
+function formatLocalFieldValidationMessage(
+  card: ReservationV4TaskCardResult,
+  context: ReservationV4FieldValidationMessageContext,
+): string {
+  const fieldLabel = localFieldLabel(card, context.field)
+  if (context.type === 'positiveInteger') {
+    return t('taskV4.fieldValidation.positiveInteger', { field: fieldLabel })
+  }
+  return t('taskV4.fieldValidation.required', { field: fieldLabel })
+}
+
+function localFieldLabel(
+  card: ReservationV4TaskCardResult,
+  field: ReservationV4TaskCardFieldResult,
+): string {
+  const pointer = field.field_pointer || fieldPathToPointer(field.field_path)
+  if (isTraceCard(card)) {
+    if (pointer.endsWith('/text')) {
+      return t('taskV4.trace.textLabel')
+    }
+    if (pointer.endsWith('/department_code')) {
+      return t('taskV4.trace.department')
+    }
+    if (pointer.endsWith('/target_room_type_code')) {
+      return t('taskV4.trace.targetRoomType')
+    }
+    if (pointer.endsWith('/extra_bed_room_count')) {
+      return t('taskV4.trace.extraBedRoomCount')
+    }
+  }
+  return field.display_name || reservationV4FieldKey(field)
+}
+
 function formatApiError(error: unknown, fallback: string): {
   message: string
   details: unknown