diff --git a/pom.xml b/pom.xml
index 8ac8955..ee44e77 100644
--- a/pom.xml
+++ b/pom.xml
@@ -11,7 +11,7 @@
 
 	<groupId>com.imyeyu.timiserverapi</groupId>
 	<artifactId>TimiServerAPI</artifactId>
-	<version>1.0.42</version>
+	<version>1.0.43</version>
 	<packaging>jar</packaging>
 	<name>TimiServerAPI</name>
 	<description>imyeyu.com API</description>
diff --git a/src/main/java/com/imyeyu/api/modules/gao/service/GaoProductSkuService.java b/src/main/java/com/imyeyu/api/modules/gao/service/GaoProductSkuService.java
index c8de44d..aaacd35 100644
--- a/src/main/java/com/imyeyu/api/modules/gao/service/GaoProductSkuService.java
+++ b/src/main/java/com/imyeyu/api/modules/gao/service/GaoProductSkuService.java
@@ -33,6 +33,14 @@ public interface GaoProductSkuService extends BaseService<GaoProductSku, String>
 	/// 查询并校验可销售 SKU 单位
 	GaoProductSkuUnitSelection getSellableSkuUnit(String storeId, String skuId, String skuUnitId);
 
+	/// 查询并校验可用于历史订单履约的 SKU 单位
+	///
+	/// @param storeId 门店 ID
+	/// @param skuId SKU ID
+	/// @param skuUnitId SKU 单位 ID
+	/// @return SKU 单位选择结果
+	GaoProductSkuUnitSelection getFulfillableSkuUnit(String storeId, String skuId, String skuUnitId);
+
 	/// 查询并校验 SKU 单位
 	GaoProductSkuUnitSelection getSkuUnit(String storeId, String skuId, String skuUnitId, boolean purchase);
 
diff --git a/src/main/java/com/imyeyu/api/modules/gao/service/implement/GaoOrderFulfillmentServiceImplement.java b/src/main/java/com/imyeyu/api/modules/gao/service/implement/GaoOrderFulfillmentServiceImplement.java
index effca17..07d5cba 100644
--- a/src/main/java/com/imyeyu/api/modules/gao/service/implement/GaoOrderFulfillmentServiceImplement.java
+++ b/src/main/java/com/imyeyu/api/modules/gao/service/implement/GaoOrderFulfillmentServiceImplement.java
@@ -450,12 +450,32 @@ public class GaoOrderFulfillmentServiceImplement extends AbstractEntityService<G
 			GaoSalesOrderItem.ItemType expectedItemType = order.getOrderType() == GaoSalesOrder.OrderType.PACKAGE
 				? GaoSalesOrderItem.ItemType.PACKAGE_ENTITLEMENT : GaoSalesOrderItem.ItemType.DIRECT_PRODUCT;
 			TimiException.requiredTrue(source.getItemType() == expectedItemType, "订单项类型与订单类型不匹配");
-			GaoProductSkuUnitSelection selection = skuService.getSellableSkuUnit(order.getStoreId(), source.getSkuId(), requestItem.getSkuUnitId());
+			if (requestItem.getSkuUnitId().equals(source.getSkuUnitId())) {
+				result.add(toSourceByOrderSnapshot(order, source, requestItem.getQuantity(), checkAvailable));
+				continue;
+			}
+			GaoProductSkuUnitSelection selection = skuService.getFulfillableSkuUnit(order.getStoreId(), source.getSkuId(), requestItem.getSkuUnitId());
 			result.add(toSource(order, source, selection.getProduct(), selection.getSku(), selection.getUnit(), requestItem.getQuantity(), checkAvailable));
 		}
 		return result;
 	}
 
+	private SourceEntry toSourceByOrderSnapshot(GaoSalesOrder order, GaoSalesOrderItem source, BigDecimal quantity, boolean checkAvailable) {
+		GaoProductSku sku = skuService.get(source.getSkuId());
+		TimiException.required(sku, "履约来源 SKU 不存在");
+		GaoProduct product = productService.get(sku.getProductId());
+		TimiException.required(product, "履约来源产品不存在");
+		TimiException.requiredTrue(order.getStoreId().equals(product.getStoreId()), "履约来源产品不属于当前门店");
+		quantity = requiredPositiveQuantity(quantity, "履约数量");
+		if (!Boolean.TRUE.equals(sku.getAllowDecimalQuantity())) {
+			TimiException.requiredTrue(quantity.stripTrailingZeros().scale() <= 0, "该产品不允许小数数量");
+		}
+		BigDecimal baseQuantityPerUnit = requiredBaseQuantityPerUnit(source.getBaseQuantityPerUnitSnapshot());
+		BigDecimal baseQuantity = toBaseQuantity(quantity, baseQuantityPerUnit, "履约基础数量最多保留三位小数");
+		return buildSource(order, source, source.getSkuUnitId(), source.getUnitSnapshot(), baseQuantityPerUnit, quantity,
+			baseQuantity, product, sku, checkAvailable);
+	}
+
 	private List<SourceEntry> loadPersistedSources(GaoSalesOrder order, List<GaoOrderFulfillmentItem> itemList) {
 		TimiException.requiredTrue(itemList != null && !itemList.isEmpty(), "履约单没有明细");
 		List<GaoOrderFulfillmentItem> sortedItemList = new ArrayList<>(itemList);
diff --git a/src/main/java/com/imyeyu/api/modules/gao/service/implement/GaoProductSkuServiceImplement.java b/src/main/java/com/imyeyu/api/modules/gao/service/implement/GaoProductSkuServiceImplement.java
index 8e85d17..965575f 100644
--- a/src/main/java/com/imyeyu/api/modules/gao/service/implement/GaoProductSkuServiceImplement.java
+++ b/src/main/java/com/imyeyu/api/modules/gao/service/implement/GaoProductSkuServiceImplement.java
@@ -109,6 +109,22 @@ public class GaoProductSkuServiceImplement extends AbstractEntityService<GaoProd
 		return getSkuUnit(storeId, skuId, skuUnitId, false);
 	}
 
+	@Override
+	public GaoProductSkuUnitSelection getFulfillableSkuUnit(String storeId, String skuId, String skuUnitId) {
+		TimiException.required(storeId, "门店 ID 不能为空");
+		TimiException.required(skuId, "SKU ID 不能为空");
+		TimiException.required(skuUnitId, "SKU 单位 ID 不能为空");
+		GaoProductSku sku = mapper.selectForUpdate(skuId);
+		TimiException.required(sku, "SKU 不存在");
+		TimiException.requiredTrue(storeId.equals(sku.getStoreId()), "SKU 不属于当前门店");
+		GaoProduct product = productServiceProvider.getObject().get(sku.getProductId());
+		TimiException.required(product, "产品不存在");
+		GaoProductSkuUnit unit = unitMapper.selectForUpdate(skuUnitId);
+		TimiException.required(unit, "SKU 单位不存在");
+		TimiException.requiredTrue(skuId.equals(unit.getSkuId()), "SKU 单位不属于当前 SKU");
+		return new GaoProductSkuUnitSelection(product, sku, unit);
+	}
+
 	@Override
 	public GaoProductSkuUnitSelection getSkuUnit(String storeId, String skuId, String skuUnitId, boolean purchase) {
 		TimiException.required(storeId, "not found storeId");
@@ -354,11 +370,8 @@ public class GaoProductSkuServiceImplement extends AbstractEntityService<GaoProd
 				TimiException.requiredTrue(1 == unitMapper.updateUnit(unit), "SKU 单位更新失败");
 			}
 		}
-		for (GaoProductSkuUnit existing : existingUnitList) {
-			if (!retainedIdSet.contains(existing.getId())) {
-				unitMapper.delete(existing.getId());
-			}
-		}
+		TimiException.requiredTrue(existingUnitList.stream().allMatch(existing -> retainedIdSet.contains(existing.getId())),
+			"已保存的 SKU 单位不能删除，请关闭允许销售和允许采购");
 	}
 
 	private void saveSpecValues(String skuId, List<String> specValueIdList) {