diff --git a/firstleg/src/main/java/com/baiyue/firstleg/service/InboundMeasurementService.java b/firstleg/src/main/java/com/baiyue/firstleg/service/InboundMeasurementService.java
index c280a3bea..f11199c15 100644
--- a/firstleg/src/main/java/com/baiyue/firstleg/service/InboundMeasurementService.java
+++ b/firstleg/src/main/java/com/baiyue/firstleg/service/InboundMeasurementService.java
@@ -466,6 +466,10 @@ public class InboundMeasurementService {
             }
             return response.data();
         } catch (FeignException exception) {
+            if (exception.status() == 400) {
+                throw new BizException(ResultCode.SERVICE_UNAVAILABLE,
+                    "订单服务申报快照契约未就绪，请同步部署 order-service 与 firstleg-service");
+            }
             throw new BizException(ResultCode.SERVICE_UNAVAILABLE, "订单服务暂不可用，无法读取客户申报数据");
         }
     }
diff --git a/firstleg/src/test/java/com/baiyue/firstleg/service/InboundMeasurementServiceTest.java b/firstleg/src/test/java/com/baiyue/firstleg/service/InboundMeasurementServiceTest.java
index 3d5b1cba3..0e6a09758 100644
--- a/firstleg/src/test/java/com/baiyue/firstleg/service/InboundMeasurementServiceTest.java
+++ b/firstleg/src/test/java/com/baiyue/firstleg/service/InboundMeasurementServiceTest.java
@@ -29,6 +29,8 @@ import java.math.BigDecimal;
 import java.time.LocalDateTime;
 import java.util.List;
 
+import feign.FeignException;
+
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
 import static org.assertj.core.api.Assertions.tuple;
@@ -147,6 +149,27 @@ class InboundMeasurementServiceTest {
         verify(repository, never()).updateInbound(any());
     }
 
+    @Test
+    void detailReportsOrderContractNotReadyInsteadOfExposingDownstreamBadRequest() {
+        InboundOrderEntity inbound = inbound("MEASURE_PENDING");
+        InboundMeasurementEntity measurement = new InboundMeasurementEntity();
+        measurement.setId(30L);
+        when(repository.findInbound(1L, 10L)).thenReturn(inbound);
+        when(repository.findLatestMeasurement(1L, 10L)).thenReturn(measurement);
+        FeignException downstreamBadRequest = mock(FeignException.class);
+        when(downstreamBadRequest.status()).thenReturn(400);
+        when(orderCargoClient.measurementDeclaration("internal-token", 1L, 80L))
+            .thenThrow(downstreamBadRequest);
+
+        assertThatThrownBy(() -> service.detail(1L, 10L))
+            .isInstanceOfSatisfying(BizException.class, exception -> {
+                assertThat(exception.getResultCode().code()).isEqualTo("S0503");
+                assertThat(exception).hasMessageContaining("申报快照契约未就绪")
+                    .hasMessageContaining("order-service")
+                    .hasMessageContaining("firstleg-service");
+            });
+    }
+
     @Test
     void detailKeepsDimensionAndWeightEvidenceOnTheirStableBusinessRecords() {
         InboundOrderEntity inbound = inbound("MEASURE_PENDING");
diff --git a/order/src/test/java/com/baiyue/order/controller/InternalOrderCargoControllerTest.java b/order/src/test/java/com/baiyue/order/controller/InternalOrderCargoControllerTest.java
index d75be5c6f..8877beb4c 100644
--- a/order/src/test/java/com/baiyue/order/controller/InternalOrderCargoControllerTest.java
+++ b/order/src/test/java/com/baiyue/order/controller/InternalOrderCargoControllerTest.java
@@ -18,8 +18,11 @@ import static org.mockito.Mockito.verifyNoMoreInteractions;
 import static org.mockito.Mockito.when;
 
 import java.math.BigDecimal;
+import java.lang.reflect.Method;
 import java.util.List;
 
+import org.springframework.web.bind.annotation.GetMapping;
+
 @SpringJUnitConfig(InternalOrderCargoController.class)
 @TestPropertySource(properties = "baiyue.security.internal-service-token=internal-token")
 class InternalOrderCargoControllerTest {
@@ -149,6 +152,21 @@ class InternalOrderCargoControllerTest {
         assertThat(result.defaultActualGoodsName()).isEqualTo("品名A、品名B");
     }
 
+    @Test
+    void measurementDeclarationHasAnExplicitStaticRouteBesideNumericCargoDetail() throws Exception {
+        Method declaration = InternalOrderCargoController.class.getMethod(
+            "measurementDeclaration", String.class, long.class, long.class);
+        Method cargoDetail = InternalOrderCargoController.class.getMethod(
+            "detail", String.class, long.class, long.class, long.class);
+
+        assertThat(declaration.getAnnotation(GetMapping.class).value())
+            .containsExactly("/{tenantId}/{orderId}/measurement-declaration");
+        assertThat(cargoDetail.getAnnotation(GetMapping.class).value())
+            .containsExactly("/{tenantId}/{orderId}/{cargoId}");
+        assertThat(declaration.getParameterCount()).isEqualTo(3);
+        assertThat(cargoDetail.getParameterCount()).isEqualTo(4);
+    }
+
     @Test
     void splitChildWithoutDirectCargoDoesNotCopyRootDeclarationTotals() {
         OrderEntity child = new OrderEntity();