diff --git a/firstleg/src/main/java/com/baiyue/firstleg/service/MeasurementLocationOccupationService.java b/firstleg/src/main/java/com/baiyue/firstleg/service/MeasurementLocationOccupationService.java
index 752ad35c4..19ea22ea6 100644
--- a/firstleg/src/main/java/com/baiyue/firstleg/service/MeasurementLocationOccupationService.java
+++ b/firstleg/src/main/java/com/baiyue/firstleg/service/MeasurementLocationOccupationService.java
@@ -174,9 +174,14 @@ public class MeasurementLocationOccupationService {
             return order.getActualVolumeCbm();
         }
         var measurement = measurements.findLatestMeasurement(tenantId, inboundId);
-        if (measurement != null && measurement.getOriginalVolumeCbm() != null
-            && measurement.getOriginalVolumeCbm().signum() > 0) {
-            return measurement.getOriginalVolumeCbm();
+        if (measurement != null) {
+            BigDecimal measuredVolume = positive(measurement.getTotalVolumeCbm());
+            BigDecimal declaredVolume = positive(measurement.getOriginalVolumeCbm());
+            if (measuredVolume != null || declaredVolume != null) {
+                if (measuredVolume == null) return declaredVolume;
+                if (declaredVolume == null) return measuredVolume;
+                return measuredVolume.max(declaredVolume);
+            }
         }
         if (order.getOrderId() == null || order.getOrderId() <= 0) {
             throw new BizException(ResultCode.CONFLICT, "入库单缺少有效实测或客户申报体积");
@@ -200,6 +205,10 @@ public class MeasurementLocationOccupationService {
         throw new BizException(ResultCode.CONFLICT, "入库单缺少有效实测或客户申报体积");
     }
 
+    private static BigDecimal positive(BigDecimal value) {
+        return value != null && value.signum() > 0 ? value : null;
+    }
+
     private static int requirePackageCount(InboundOrderEntity order) {
         if (order.getTotalPackageCount() == null || order.getTotalPackageCount() <= 0) {
             throw new BizException(ResultCode.CONFLICT, "入库单缺少有效总箱数");
diff --git a/firstleg/src/test/java/com/baiyue/firstleg/service/MeasurementLocationOccupationServiceTest.java b/firstleg/src/test/java/com/baiyue/firstleg/service/MeasurementLocationOccupationServiceTest.java
index 98b45698b..7e14d9d89 100644
--- a/firstleg/src/test/java/com/baiyue/firstleg/service/MeasurementLocationOccupationServiceTest.java
+++ b/firstleg/src/test/java/com/baiyue/firstleg/service/MeasurementLocationOccupationServiceTest.java
@@ -144,6 +144,7 @@ class MeasurementLocationOccupationServiceTest {
         InboundOrderEntity inbound = inbound();
         inbound.setActualVolumeCbm(null);
         InboundMeasurementEntity measurement = new InboundMeasurementEntity();
+        measurement.setTotalVolumeCbm(new BigDecimal("1.0000"));
         measurement.setOriginalVolumeCbm(new BigDecimal("2.5000"));
         when(workflow.findOwned(BUSINESS_TENANT, INBOUND)).thenReturn(inbound);
         when(measurements.findLatestMeasurement(BUSINESS_TENANT, INBOUND)).thenReturn(measurement);
@@ -162,6 +163,32 @@ class MeasurementLocationOccupationServiceTest {
             20, new BigDecimal("2.5000"), block("OCCUPIED", 3));
     }
 
+    @Test
+    void reservesByCurrentMeasuredVolumeBeforeFrozenDeclaredVolume() {
+        InboundOrderEntity inbound = inbound();
+        inbound.setActualVolumeCbm(null);
+        InboundMeasurementEntity measurement = new InboundMeasurementEntity();
+        measurement.setTotalVolumeCbm(new BigDecimal("2.5000"));
+        measurement.setOriginalVolumeCbm(new BigDecimal("1.0000"));
+        when(workflow.findOwned(BUSINESS_TENANT, INBOUND)).thenReturn(inbound);
+        when(measurements.findLatestMeasurement(BUSINESS_TENANT, INBOUND)).thenReturn(measurement);
+        when(measurements.listWeights(BUSINESS_TENANT, INBOUND))
+            .thenReturn(confirmedWeights().subList(0, 1));
+        when(warehouse.reserveBlock(org.mockito.ArgumentMatchers.eq("internal-token"),
+            org.mockito.ArgumentMatchers.any())).thenReturn(ApiResponse.success(block("RESERVED", 3)));
+        when(warehouse.confirmBlock(org.mockito.ArgumentMatchers.eq("internal-token"),
+            org.mockito.ArgumentMatchers.any())).thenReturn(ApiResponse.success(block("OCCUPIED", 3)));
+
+        service.ensureForConfirmedWeight(BUSINESS_TENANT, INBOUND, OPERATOR, MEASUREMENT, 3);
+
+        verify(orderCargo, never()).measurementDeclaration(org.mockito.ArgumentMatchers.anyString(),
+            org.mockito.ArgumentMatchers.anyLong(), org.mockito.ArgumentMatchers.anyLong());
+        verify(warehouse).reserveBlock(org.mockito.ArgumentMatchers.eq("internal-token"),
+            org.mockito.ArgumentMatchers.argThat(request -> request.requiredSlotCount() == 3));
+        verify(allocations).replaceBlock(BUSINESS_TENANT, INBOUND, WAREHOUSE,
+            20, new BigDecimal("2.5000"), block("OCCUPIED", 3));
+    }
+
     @Test
     void fallsBackToLatestOrderDeclarationWhenNoMeasurementBatchExists() {
         InboundOrderEntity inbound = inbound();