调整手工开票Rate校验和夜数派生

client/src/i18n/locales/en-US.ts

@@ -369,6 +369,7 @@ export default {
       required: 'Required',
       invalidEmail: 'Invalid email',
       dateOrder: 'Invalid date order',
+      invalidNumber: 'Invalid number',
       positiveNumber: 'Must be greater than 0',
       nonNegativeNumber: 'Cannot be less than 0',
     },
@@ -391,8 +392,10 @@ export default {
       invalidEmail: 'Email format is invalid.',
       dueDateBeforeBookingDate: 'Due date cannot be earlier than booking date.',
       departureBeforeArrival: 'Departure date must be later than arrival date.',
+      invalidNumber: 'Invalid number. Check amount, quantity, or nights fields.',
       extraBedNegative: 'Extra bed rate cannot be less than 0.',
-      chargePositive: 'Quantity, rate, and nights must be greater than 0.',
+      chargePositive: 'Quantity and nights must be greater than 0.',
+      chargeRateNonNegative: 'Rate cannot be less than 0.',
     },
   },
   roomingList: {

client/src/i18n/locales/th-TH.ts

@@ -369,6 +369,7 @@ export default {
       required: 'จำเป็นต้องกรอก',
       invalidEmail: 'รูปแบบ Email ไม่ถูกต้อง',
       dateOrder: 'ลำดับวันที่ไม่ถูกต้อง',
+      invalidNumber: 'รูปแบบตัวเลขไม่ถูกต้อง',
       positiveNumber: 'ต้องมากกว่า 0',
       nonNegativeNumber: 'ต้องไม่ต่ำกว่า 0',
     },
@@ -391,8 +392,10 @@ export default {
       invalidEmail: 'รูปแบบ Email ไม่ถูกต้อง',
       dueDateBeforeBookingDate: 'Due Date ต้องไม่เร็วกว่าวันที่ Booking',
       departureBeforeArrival: 'Departure Date ต้องหลัง Arrival Date',
+      invalidNumber: 'รูปแบบตัวเลขไม่ถูกต้อง กรุณาตรวจจำนวนเงิน จำนวนห้อง หรือจำนวนคืน',
       extraBedNegative: 'Extra Bed Rate ต้องไม่ต่ำกว่า 0',
-      chargePositive: 'Quantity, Rate และ Nights ต้องมากกว่า 0',
+      chargePositive: 'Quantity และ Nights ต้องมากกว่า 0',
+      chargeRateNonNegative: 'Rate ต้องไม่ต่ำกว่า 0',
     },
   },
   roomingList: {

client/src/i18n/locales/zh-CN.ts

@@ -369,6 +369,7 @@ export default {
       required: '必填',
       invalidEmail: 'Email 格式不正确',
       dateOrder: '日期顺序不正确',
+      invalidNumber: '数字格式不正确',
       positiveNumber: '必须大于 0',
       nonNegativeNumber: '不能小于 0',
     },
@@ -391,8 +392,10 @@ export default {
       invalidEmail: 'Email 格式不正确。',
       dueDateBeforeBookingDate: 'Due Date 不能早于 Booking 日期。',
       departureBeforeArrival: 'Departure Date 必须晚于 Arrival Date。',
+      invalidNumber: '数字格式不正确，请检查金额、数量或夜数字段。',
       extraBedNegative: '加床价格不能小于 0。',
-      chargePositive: '费用明细的 Quantity、Rate、Nights 必须大于 0。',
+      chargePositive: '费用明细的 Quantity 和 Nights 必须大于 0。',
+      chargeRateNonNegative: '费用明细的 Rate 不能小于 0。',
     },
   },
   roomingList: {

client/src/tests/manualInvoiceView.spec.ts

@@ -347,7 +347,7 @@ describe('ReservationManualInvoiceView', () => {
     await wrapper.find('[data-testid="recipient-email"]').setValue('bad-email')
     await wrapper.find('[data-testid="booking-departure-date"]').setValue('2026-07-19')
     await wrapper.find('[data-testid="booking-extra-bed-rate"]').setValue('-1')
-    await wrapper.find('[data-testid="charge-rate-0"]').setValue('0')
+    await wrapper.find('[data-testid="charge-rate-0"]').setValue('zzz')
     await wrapper.find('[data-testid="manual-invoice-submit"]').trigger('click')
     await flushPromises()
 
@@ -366,10 +366,51 @@ describe('ReservationManualInvoiceView', () => {
     )
     expect(wrapper.find('[data-testid="charge-rate-0"]').classes()).toContain('is-invalid')
     expect(wrapper.find('[data-testid="manual-invoice-field-error-charge-0-rate"]').text()).toBe(
-      zhCN.manualInvoice.fieldErrors.positiveNumber,
+      zhCN.manualInvoice.fieldErrors.invalidNumber,
     )
   })
 
+  it('allows zero room rate and charge rate while keeping rate required and numeric', async () => {
+    vi.mocked(service.generateManualReservationInvoice).mockResolvedValue(createResult())
+    const wrapper = mountView()
+
+    await wrapper.find('[data-testid="recipient-company-code"]').setValue('QBD')
+    await fillMinimumInvoiceForm(wrapper)
+    await wrapper.find('[data-testid="primary-room-rate"]').setValue('0')
+    await wrapper.find('[data-testid="manual-invoice-submit"]').trigger('click')
+    await flushPromises()
+
+    expect(wrapper.find('[data-testid="primary-room-rate"]').classes()).not.toContain('is-invalid')
+    expect(wrapper.find('[data-testid="manual-invoice-field-error-primary-rate"]').exists()).toBe(false)
+    expect(service.generateManualReservationInvoice).toHaveBeenCalledWith(
+      expect.objectContaining({
+        invoice_payload: expect.objectContaining({
+          charges: [
+            expect.objectContaining({
+              rate: 0,
+            }),
+          ],
+        }),
+      }),
+    )
+  })
+
+  it('auto-fills primary nights from stay dates until the user edits nights manually', async () => {
+    const wrapper = mountView()
+
+    await wrapper.find('[data-testid="booking-arrival-date"]').setValue('2026-07-20')
+    await wrapper.find('[data-testid="booking-departure-date"]').setValue('2026-07-22')
+
+    expect((wrapper.find('[data-testid="primary-night-count"]').element as HTMLInputElement).value).toBe('2')
+    expect((wrapper.find('[data-testid="charge-nights-0"]').element as HTMLInputElement).value).toBe('2')
+
+    await wrapper.find('[data-testid="primary-night-count"]').setValue('3')
+    await wrapper.find('[data-testid="booking-departure-date"]').setValue('2026-07-24')
+
+    expect((wrapper.find('[data-testid="primary-night-count"]').element as HTMLInputElement).value).toBe('3')
+    expect((wrapper.find('[data-testid="charge-nights-0"]').element as HTMLInputElement).value).toBe('3')
+  })
+
   it('does not render final-format date preview blocks', () => {
     const wrapper = mountView()
 

client/src/views/reservation/ReservationManualInvoiceView.vue

@@ -277,6 +277,7 @@
                   :invalid="Boolean(fieldError('arrival-date'))"
                   :described-by="fieldError('arrival-date') ? fieldErrorId('arrival-date') : undefined"
                   required
+                  @update:model-value="derivePrimaryNightsFromStayDates"
                 />
               </div>
               <p
@@ -306,6 +307,7 @@
                   :invalid="Boolean(fieldError('departure-date'))"
                   :described-by="fieldError('departure-date') ? fieldErrorId('departure-date') : undefined"
                   required
+                  @update:model-value="derivePrimaryNightsFromStayDates"
                 />
               </div>
               <p
@@ -464,6 +466,7 @@
                   :class="validationClass('primary-nights')"
                   v-bind="validationAria('primary-nights')"
                   required
+                  @input="markPrimaryNightsEdited"
                 >
                 <span
                   class="number-suffix"
@@ -630,6 +633,7 @@
                     :class="validationClass(chargeFieldKey(index, 'nights'))"
                     v-bind="validationAria(chargeFieldKey(index, 'nights'))"
                     required
+                    @input="markChargeNightsEdited(index)"
                   >
                   <span
                     v-if="fieldError(chargeFieldKey(index, 'nights'))"
@@ -961,6 +965,7 @@ const downloadMessageKey = ref('')
 const alertTone = ref<'error' | 'success'>('error')
 const generationResult = ref<ManualInvoiceGenerationResult | null>(null)
 const documentDatesEdited = ref(false)
+const primaryNightsEdited = ref(false)
 const validationAttempted = ref(false)
 
 const recipientContacts = computed(() => {
@@ -1176,15 +1181,38 @@ function validateForm(): string[] {
     Boolean(form.booking.group_name.trim()) &&
     Boolean(form.booking.arrival_date) &&
     Boolean(form.booking.departure_date)
-  const charges = buildCharges()
   const extraBedRate = optionalNumberValue(form.booking.extra_bed_rate)
+  const hasInvalidChargeNumber = form.charges.some(
+    (charge) =>
+      hasInvalidNumericInput(charge.quantity) || hasInvalidNumericInput(charge.rate) || hasInvalidNumericInput(charge.nights),
+  )
+  const hasInvalidExtraBedRate = hasNumericInputValue(form.booking.extra_bed_rate) && extraBedRate === null
   const hasRequiredCharges =
-    charges.length > 0 &&
+    form.charges.length > 0 &&
-    charges.every((charge) => charge.description && charge.room_type && charge.quantity > 0 && charge.rate > 0 && charge.nights > 0)
+    form.charges.every(
+      (charge) =>
+        Boolean(charge.description.trim()) &&
+        Boolean(charge.room_type.trim()) &&
+        hasNumericInputValue(charge.quantity) &&
+        hasNumericInputValue(charge.rate) &&
+        hasNumericInputValue(charge.nights),
+    )
+  const hasInvalidQuantityOrNights = form.charges.some((charge) => {
+    const quantity = optionalNumberValue(charge.quantity)
+    const nights = optionalNumberValue(charge.nights)
+    return (quantity !== null && quantity <= 0) || (nights !== null && nights <= 0)
+  })
+  const hasNegativeRate = form.charges.some((charge) => {
+    const rate = optionalNumberValue(charge.rate)
+    return rate !== null && rate < 0
+  })
 
   if (!hasRequiredDocument || !hasRequiredRecipient || !hasRequiredBooking || !hasRequiredCharges) {
     errors.push(t('manualInvoice.errors.requiredFields'))
   }
+  if (hasInvalidChargeNumber || hasInvalidExtraBedRate) {
+    errors.push(t('manualInvoice.errors.invalidNumber'))
+  }
   if (form.recipient.email && !/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(form.recipient.email)) {
     errors.push(t('manualInvoice.errors.invalidEmail'))
   }
@@ -1198,18 +1226,22 @@ function validateForm(): string[] {
   ) {
     errors.push(t('manualInvoice.errors.departureBeforeArrival'))
   }
-  if (form.booking.extra_bed_rate.trim() && (extraBedRate === null || extraBedRate < 0)) {
+  if (extraBedRate !== null && extraBedRate < 0) {
     errors.push(t('manualInvoice.errors.extraBedNegative'))
   }
-  if (charges.some((charge) => charge.quantity <= 0 || charge.rate <= 0 || charge.nights <= 0)) {
+  if (hasInvalidQuantityOrNights) {
     errors.push(t('manualInvoice.errors.chargePositive'))
   }
+  if (hasNegativeRate) {
+    errors.push(t('manualInvoice.errors.chargeRateNonNegative'))
+  }
   return [...new Set(errors)]
 }
 
 function collectFieldErrors(): FieldErrorMap {
   const errors: FieldErrorMap = {}
   const positiveNumber = t('manualInvoice.fieldErrors.positiveNumber')
+  const nonNegativeNumber = t('manualInvoice.fieldErrors.nonNegativeNumber')
 
   setRequiredError(errors, 'company', form.recipient.company)
   setRequiredError(errors, 'attention', form.recipient.attention)
@@ -1237,21 +1269,24 @@ function collectFieldErrors(): FieldErrorMap {
     errors['departure-date'] = t('manualInvoice.fieldErrors.dateOrder')
   }
 
-  const extraBedRate = optionalNumberValue(form.booking.extra_bed_rate)
+  const extraBedRate = validateOptionalNumericField(errors, 'extra-bed-rate', form.booking.extra_bed_rate)
-  if (form.booking.extra_bed_rate.trim() && (extraBedRate === null || extraBedRate < 0)) {
+  if (extraBedRate !== null && extraBedRate < 0) {
-    errors['extra-bed-rate'] = t('manualInvoice.fieldErrors.nonNegativeNumber')
+    errors['extra-bed-rate'] = nonNegativeNumber
   }
 
   form.charges.forEach((charge, index) => {
     setRequiredError(errors, chargeFieldKey(index, 'description'), charge.description)
     setRequiredError(errors, chargeFieldKey(index, 'room-type'), charge.room_type)
-    if (numberValue(charge.quantity) <= 0) {
+    const quantity = validateRequiredNumericField(errors, chargeFieldKey(index, 'quantity'), charge.quantity)
+    if (quantity !== null && quantity <= 0) {
       errors[chargeFieldKey(index, 'quantity')] = positiveNumber
     }
-    if (numberValue(charge.rate) <= 0) {
+    const rate = validateRequiredNumericField(errors, chargeFieldKey(index, 'rate'), charge.rate)
-      errors[chargeFieldKey(index, 'rate')] = positiveNumber
+    if (rate !== null && rate < 0) {
+      errors[chargeFieldKey(index, 'rate')] = nonNegativeNumber
     }
-    if (numberValue(charge.nights) <= 0) {
+    const nights = validateRequiredNumericField(errors, chargeFieldKey(index, 'nights'), charge.nights)
+    if (nights !== null && nights <= 0) {
       errors[chargeFieldKey(index, 'nights')] = positiveNumber
     }
   })
@@ -1278,6 +1313,39 @@ function setRequiredError(errors: FieldErrorMap, fieldKey: string, value: string
   }
 }
 
+function validateRequiredNumericField(errors: FieldErrorMap, fieldKey: string, value: string | number): number | null {
+  if (!hasNumericInputValue(value)) {
+    errors[fieldKey] = t('manualInvoice.fieldErrors.required')
+    return null
+  }
+  const parsed = optionalNumberValue(value)
+  if (parsed === null) {
+    errors[fieldKey] = t('manualInvoice.fieldErrors.invalidNumber')
+    return null
+  }
+  return parsed
+}
+
+function validateOptionalNumericField(errors: FieldErrorMap, fieldKey: string, value: string | number): number | null {
+  if (!hasNumericInputValue(value)) {
+    return null
+  }
+  const parsed = optionalNumberValue(value)
+  if (parsed === null) {
+    errors[fieldKey] = t('manualInvoice.fieldErrors.invalidNumber')
+    return null
+  }
+  return parsed
+}
+
+function hasInvalidNumericInput(value: string | number): boolean {
+  return hasNumericInputValue(value) && optionalNumberValue(value) === null
+}
+
+function hasNumericInputValue(value: string | number): boolean {
+  return String(value).trim() !== ''
+}
+
 function fieldError(fieldKey: string): string {
   return fieldErrors.value[fieldKey] ?? ''
 }
@@ -1382,6 +1450,27 @@ function markDocumentDatesEdited(): void {
   documentDatesEdited.value = true
 }
 
+function markPrimaryNightsEdited(): void {
+  primaryNightsEdited.value = true
+}
+
+function markChargeNightsEdited(index: number): void {
+  if (index === 0) {
+    markPrimaryNightsEdited()
+  }
+}
+
+function derivePrimaryNightsFromStayDates(): void {
+  if (primaryNightsEdited.value) {
+    return
+  }
+  const nights = stayNights(form.booking.arrival_date, form.booking.departure_date)
+  if (nights === null) {
+    return
+  }
+  primaryCharge.value.nights = String(nights)
+}
+
 function applyDefaultDocumentDates(timeZone: string): void {
   const dates = createDefaultDocumentDates(timeZone)
   form.document.invoice_date = dates.invoiceDate
@@ -1483,6 +1572,31 @@ function addDaysToDateInputValue(dateValue: string, days: number): string {
   ].join('-')
 }
 
+function stayNights(arrivalDate: string, departureDate: string): number | null {
+  if (!arrivalDate || !departureDate || departureDate <= arrivalDate) {
+    return null
+  }
+  const arrival = dateInputValueToUtcDate(arrivalDate)
+  const departure = dateInputValueToUtcDate(departureDate)
+  if (!arrival || !departure) {
+    return null
+  }
+  const nights = Math.round((departure.getTime() - arrival.getTime()) / 86_400_000)
+  return nights > 0 ? nights : null
+}
+
+function dateInputValueToUtcDate(dateValue: string): Date | null {
+  const [year = 0, month = 0, day = 0] = dateValue.split('-').map((part) => Number(part))
+  if (!year || !month || !day) {
+    return null
+  }
+  const date = new Date(Date.UTC(year, month - 1, day))
+  if (date.getUTCFullYear() !== year || date.getUTCMonth() + 1 !== month || date.getUTCDate() !== day) {
+    return null
+  }
+  return date
+}
+
 function formatDateParts(date: Date, timeZone: string): Intl.DateTimeFormatPart[] {
   return new Intl.DateTimeFormat('en-GB', {
     timeZone,

docs/project/frontend-backend/backend-to-frontend-notes.md

@@ -449,6 +449,8 @@ M009 后端 CP2 已实现：页面可不依赖订单或任务，用户手工填
 - Company、Attention、Address、Tel、Email 是一组收件方联系人档案，不是五个互相独立字段；选择 Company 后应刷新 Attention 候选，选择 Attention 后应带出 Address、Tel、Email。Booking Date 展示在同一区域，但不属于联系人档案，应作为 `document.booking_date` 独立提交。
 - 第一阶段已确认三组客户 / 旅行社种子数据：`LIAN_TAI` / `LIAN TAI TRAVEL (THAILAND) CO., LTD.` + `Khun Ann`；`QBD` / `Q.B.D. TRAVEL GROUP CO., LTD` + `Jitdanun Panaphuchong`；`HANATOUR` / `HANATOUR TD CO., LTD.` + 7 个联系人。完整数据以 `docs/project/requirements/M009-manual-invoice-generation-v1.md` 为准。
 - Room Type、Room Rate、Extra Bed 建议也预留“选择 + 可手填 / 可覆盖”能力，后续接 PMS 房型、Rate Code 或价格配置。
+- Room Rate / 费用明细 Rate 第一阶段只校验必填、数字格式和非负数，允许 `0`；Quantity 和 Nights 仍必须大于 `0`。
+- No.of Night(s) 前端默认按 `Departure Date - Arrival Date` 自动填入第一条费用明细 Night(s)，用户手工修改后保留用户输入，不再因日期变化覆盖。
 - Amount、Sub-Total、VAT、Total 是只读计算字段；前端可展示预览，但最终金额以后端计算和模板公式为准。
 - 酒店名称、Tax ID、法人主体、银行账户、Logo 和固定付款文案不应作为每张 Invoice 的手工输入；第一阶段可由模板或酒店发票配置提供。
 - 正式业务生成接口为 `POST /api/reservation/invoices/manual-generations`，需要 Bearer token、酒店访问权和 `RESERVATION_INVOICE_GENERATE` 权限。

docs/project/frontend-backend/frontend-to-backend-api-requests.md

@@ -1175,6 +1175,7 @@ POST /api/reservation/invoices/manual-generations
 - 如果前端同时传 `task_id` 和 `order_id`，必须保证任务属于该订单；后端不一致时返回 `RESERVATION_INVOICE_CONTEXT_MISMATCH`。
 - `recipient.company_code` 和 `recipient.contact_id` 用于表达目录选择结果；`company`、`attention`、`address`、`telephone`、`email` 是最终用于生成 PDF 的文本值，Manual 覆盖时也必须提交。
 - 后端需要重新计算金额、VAT 和合计；前端计算只做预览。
+- `charges[].rate` 必填且必须是数字，允许 `0`，不能小于 `0`；`charges[].quantity` 和 `charges[].nights` 仍必须大于 `0`。
 - 后端需要返回可预览 / 下载的 PDF URL。
 - `pdf_url` 第一版可作为预览地址；前端会优先用浏览器 `fetch + Blob` 触发下载，避免跨域场景下 `<a download>` 失效。如果 OSS CORS 不允许浏览器读取文件，前端会退回打开 PDF 页面。后续如要求稳定下载体验，建议后端提供带 `Content-Disposition` 的受控下载代理或签名下载 URL。
 - 该接口应走 Bearer 登录、酒店访问权和 `RESERVATION_INVOICE_GENERATE` 权限，不走 M008 调试上传 access key。

docs/project/requirements/M009-manual-invoice-generation-v1.md

@@ -135,11 +135,11 @@
 | Arrival Date | 日期输入 | 手工填写；任务预填时来自任务字段 |
 | Departure Date | 日期输入 | 手工填写；任务预填时来自任务字段 |
 | Due Date | 日期输入 | 手工填写；可按酒店付款规则默认生成 |
-| Room Rate | 选择 + 可手填 | 第一阶段可手填；后续接 Rate Code / 房价配置 |
+| Room Rate | 选择 + 可手填 | 第一阶段可手填；必填且必须是数字，允许 `0`，不能小于 `0`；后续接 Rate Code / 房价配置 |
 | Room Rate Note | 输入框 | 例如 `includingBF` |
 | Extra bed | 选择 + 可手填 | 第一阶段可手填；后续接加床价格配置 |
 | No. of Room(s) | 输入框 / 只读派生 | 可由第一条明细同步，也允许手工覆盖 |
-| No. of Night(s) | 输入框 / 日期派生 | 可由 Arrival / Departure 派生，也允许手工覆盖 |
+| No. of Night(s) | 输入框 / 日期派生 | 前端默认按 `Departure Date - Arrival Date` 自动填入第一条明细 Night(s)，用户手工修改后不再覆盖 |
 
 ### 4.3 Description & Amount
 
@@ -148,7 +148,7 @@
 | Description | 输入框 | 手工填写；默认可使用 Group Name 或 Booking No |
 | Room Types | 选择 + 可手填 | 第一阶段可手填；后续接 PMS 房型目录 |
 | Quantity(s) | 数字输入 | 后端要求正数 |
-| Rate | 数字输入 | 后端要求正数 |
+| Rate | 数字输入 | 后端要求必填、数字且不能小于 `0`，允许 `0` |
 | Night(s) | 数字输入 | 后端要求正数 |
 | Amount | 只读 | `quantity * rate * nights` |
 | Sub-Total | 只读 | 后端按 VAT 规则计算 |

server/src/main/java/cn/nianxx/thhotel/workflows/reservation/service/impl/ReservationInvoiceGenerationServiceImpl.java

@@ -294,7 +294,7 @@ public class ReservationInvoiceGenerationServiceImpl implements ReservationInvoi
                 errors.add(prefix + "room_type: 必填字段缺失。");
             }
             validatePositive(charge.quantity(), prefix + "quantity", errors);
-            validatePositive(charge.rate(), prefix + "rate", errors);
+            validateNonNegative(charge.rate(), prefix + "rate", errors);
             validatePositive(charge.nights(), prefix + "nights", errors);
         }
     }
@@ -490,6 +490,16 @@ public class ReservationInvoiceGenerationServiceImpl implements ReservationInvoi
         }
     }
 
+    private void validateNonNegative(BigDecimal value, String fieldPath, List<String> errors) {
+        if (value == null) {
+            errors.add(fieldPath + ": 必填字段缺失。");
+            return;
+        }
+        if (value.compareTo(BigDecimal.ZERO) < 0) {
+            errors.add(fieldPath + ": 不能小于 0。");
+        }
+    }
+
     private String writeJson(Object value) {
         try {
             return objectMapper.writeValueAsString(value);

server/src/test/java/cn/nianxx/thhotel/workflows/reservation/control/ReservationInvoiceGenerationControllerTest.java

@@ -195,6 +195,34 @@ class ReservationInvoiceGenerationControllerTest {
         verifyNoInteractions(excelToPdfConverter, objectStorageService);
     }
 
+    @Test
+    void shouldAllowManualInvoiceChargeRateToBeZero() throws Exception {
+        byte[] pdfBytes = "%PDF-1.7\nmanual-invoice-zero-rate".getBytes(StandardCharsets.UTF_8);
+        when(excelToPdfConverter.convert(any())).thenReturn(new ExcelToPdfConvertedDocument(
+                "proforma-invoice.pdf",
+                MediaType.APPLICATION_PDF_VALUE,
+                (long) pdfBytes.length,
+                pdfBytes,
+                88L));
+        when(objectStorageService.putObject(any())).thenAnswer(invocation -> {
+            ObjectStoragePutRequest request = invocation.getArgument(0);
+            return new ObjectStoragePutResult(
+                    request.objectKey(),
+                    "https://oss.example.test/" + request.objectKey(),
+                    request.contentType(),
+                    request.sizeBytes());
+        });
+        String token = loginToken(mockMvc, "invoice-admin", "Admin@123456");
+
+        performAuthorized(mockMvc, token, post(ENDPOINT)
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content(validRequest().replace("\"rate\": 3000", "\"rate\": 0")))
+                .andExpect(status().isCreated())
+                .andExpect(jsonPath("$.totals.subtotal").value(0.00))
+                .andExpect(jsonPath("$.totals.vat").value(0.00))
+                .andExpect(jsonPath("$.totals.total").value(0.00));
+    }
+
     @Test
     void shouldRejectManualInvoiceWhenTaskDoesNotBelongToOrder() throws Exception {
         insertOrder(2080010000000000001L, 2080010000000000101L, "GRP-M009-ORDER-1");