diff --git a/yudao-module-oa/src/main/java/cn/iocoder/yudao/module/oa/dal/dataobject/vehicle/OaVehicleDO.java b/yudao-module-oa/src/main/java/cn/iocoder/yudao/module/oa/dal/dataobject/vehicle/OaVehicleDO.java
index d1e4f1c..31c50fd 100644
--- a/yudao-module-oa/src/main/java/cn/iocoder/yudao/module/oa/dal/dataobject/vehicle/OaVehicleDO.java
+++ b/yudao-module-oa/src/main/java/cn/iocoder/yudao/module/oa/dal/dataobject/vehicle/OaVehicleDO.java
@@ -46,6 +46,7 @@ public class OaVehicleDO extends BaseDO {
      *
      * 关联 {@link DeptRespDTO#getId()}
      */
+    @TableField(updateStrategy = FieldStrategy.ALWAYS)
     private Long deptId;
     /**
      * 车型
diff --git a/yudao-module-oa/src/test/java/cn/iocoder/yudao/module/oa/service/plan/OaPlanServiceImplTest.java b/yudao-module-oa/src/test/java/cn/iocoder/yudao/module/oa/service/plan/OaPlanServiceImplTest.java
index b028fcd..b5cf8a2 100644
--- a/yudao-module-oa/src/test/java/cn/iocoder/yudao/module/oa/service/plan/OaPlanServiceImplTest.java
+++ b/yudao-module-oa/src/test/java/cn/iocoder/yudao/module/oa/service/plan/OaPlanServiceImplTest.java
@@ -190,13 +190,13 @@ public class OaPlanServiceImplTest extends BaseDbUnitTest {
         // mock 数据：已有点评与本次追加内容按字符数计算
         Long ownerId = randomLongId();
         Long managerId = randomLongId();
-        OaPlanDO plan = buildPlanDO(ownerId).setComment(StrUtil.repeat("a", 65533 - System.lineSeparator().length()));
+        OaPlanDO plan = buildPlanDO(ownerId).setComment(StrUtil.repeat("a", 998 - System.lineSeparator().length()));
         planMapper.insert(plan);
         // mock 方法
         when(adminUserApi.getUserListBySubordinate(managerId)).thenReturn(
                 Collections.singletonList(new AdminUserRespDTO().setId(ownerId)));
 
-        // 调用：包含换行后恰好达到 65535 个字符
+        // 调用：包含换行后恰好达到 1000 个字符
         planService.addPlanComment(plan.getId(), "ab", managerId);
 
         // 断言
@@ -209,7 +209,7 @@ public class OaPlanServiceImplTest extends BaseDbUnitTest {
         // mock 数据：已有点评与本次追加内容按字符数计算
         Long ownerId = randomLongId();
         Long managerId = randomLongId();
-        OaPlanDO plan = buildPlanDO(ownerId).setComment(StrUtil.repeat("a", 65533 - System.lineSeparator().length()));
+        OaPlanDO plan = buildPlanDO(ownerId).setComment(StrUtil.repeat("a", 998 - System.lineSeparator().length()));
         planMapper.insert(plan);
         // mock 方法
         when(adminUserApi.getUserListBySubordinate(managerId)).thenReturn(
@@ -220,7 +220,7 @@ public class OaPlanServiceImplTest extends BaseDbUnitTest {
                 () -> planService.addPlanComment(plan.getId(), "abc", managerId));
         assertTrue(exception.getConstraintViolations().stream().anyMatch(violation ->
                 "comment".equals(violation.getPropertyPath().toString())
-                        && "点评内容长度不能超过 65535 个字符".equals(violation.getMessage())));
+                        && "点评内容长度不能超过 1000 个字符".equals(violation.getMessage())));
         assertEquals(plan.getComment(), planMapper.selectById(plan.getId()).getComment());
     }
 
diff --git a/yudao-module-oa/src/test/java/cn/iocoder/yudao/module/oa/service/vehicle/OaVehicleServiceImplTest.java b/yudao-module-oa/src/test/java/cn/iocoder/yudao/module/oa/service/vehicle/OaVehicleServiceImplTest.java
index 5ac5fad..0728c68 100644
--- a/yudao-module-oa/src/test/java/cn/iocoder/yudao/module/oa/service/vehicle/OaVehicleServiceImplTest.java
+++ b/yudao-module-oa/src/test/java/cn/iocoder/yudao/module/oa/service/vehicle/OaVehicleServiceImplTest.java
@@ -16,9 +16,11 @@ import java.math.BigDecimal;
 import java.time.LocalDateTime;
 import java.util.Collections;
 
+import static cn.iocoder.yudao.framework.common.exception.util.ServiceExceptionUtil.exception;
 import static cn.iocoder.yudao.framework.test.core.util.AssertUtils.assertServiceException;
 import static cn.iocoder.yudao.framework.test.core.util.RandomUtils.randomPojo;
 import static cn.iocoder.yudao.module.oa.enums.ErrorCodeConstants.*;
+import static cn.iocoder.yudao.module.system.enums.ErrorCodeConstants.DEPT_NOT_FOUND;
 import static org.junit.jupiter.api.Assertions.*;
 import static org.mockito.Mockito.*;
 
@@ -187,6 +189,25 @@ public class OaVehicleServiceImplTest extends BaseDbUnitTest {
     }
 
     @Test
+    public void testUpdateVehicle_deptInvalid() {
+        // mock 数据
+        OaVehicleDO vehicle = randomVehicleDO().setDeptId(103L).setPicUrl("https://example.com/old.png");
+        vehicleMapper.insert(vehicle);
+        // 准备参数
+        OaVehicleSaveReqVO reqVO = BeanUtils.toBean(vehicle, OaVehicleSaveReqVO.class)
+                .setDeptId(104L).setPicUrl("https://example.com/new.png");
+        // mock 方法
+        doThrow(exception(DEPT_NOT_FOUND)).when(deptApi).validateDeptList(Collections.singleton(104L));
+
+        // 调用，并断言异常
+        assertServiceException(() -> vehicleService.updateVehicle(reqVO), DEPT_NOT_FOUND);
+        // 断言：部门校验失败时不更新车辆
+        OaVehicleDO dbVehicle = vehicleMapper.selectById(vehicle.getId());
+        assertEquals(103L, dbVehicle.getDeptId());
+        assertEquals("https://example.com/old.png", dbVehicle.getPicUrl());
+    }
+
+    @Test
     public void testCreateVehicle_deletedPlateCanBeReused() {
         // mock 数据
         OaVehicleDO vehicle = randomVehicleDO();