feat: 입고 아이템 수정 기능 구현

src/main/java/com/almang/inventory/global/api/SuccessMessage.java

@@ -55,6 +55,7 @@ public enum SuccessMessage {
     UPDATE_RECEIPT_SUCCESS("입고 수정 성공"),
     DELETE_RECEIPT_SUCCESS("입고 삭제 성공"),
     GET_RECEIPT_ITEM_SUCCESS("입고 아이템 조회 성공"),
+    UPDATE_RECEIPT_ITEM_SUCCESS("입고 아이템 수정 성공"),
     ;
 
     private final String message;

src/main/java/com/almang/inventory/receipt/controller/ReceiptController.java

@@ -5,6 +5,7 @@
 import com.almang.inventory.global.api.SuccessMessage;
 import com.almang.inventory.global.security.principal.CustomUserPrincipal;
 import com.almang.inventory.receipt.domain.ReceiptStatus;
+import com.almang.inventory.receipt.dto.request.UpdateReceiptItemRequest;
 import com.almang.inventory.receipt.dto.request.UpdateReceiptRequest;
 import com.almang.inventory.receipt.dto.response.DeleteReceiptResponse;
 import com.almang.inventory.receipt.dto.response.ReceiptItemResponse;
@@ -149,4 +150,20 @@ public ResponseEntity<ApiResponse<ReceiptItemResponse>> getReceiptItem(
                 ApiResponse.success(SuccessMessage.GET_RECEIPT_ITEM_SUCCESS.getMessage(), response)
         );
     }
+
+    @PatchMapping("/receipt/{receiptItemId}")
+    @Operation(summary = "입고 아이템 수정", description = "입고 아이템을 수정합니다.")
+    public ResponseEntity<ApiResponse<ReceiptItemResponse>> updateReceiptItem(
+            @PathVariable Long receiptItemId,
+            @Valid @RequestBody UpdateReceiptItemRequest request,
+            @AuthenticationPrincipal CustomUserPrincipal userPrincipal
+    ) {
+        Long userId = userPrincipal.getId();
+        log.info("[ReceiptController] 입고 아이템 수정 요청 - userId: {}, receiptItemId: {}", userId, receiptItemId);
+        ReceiptItemResponse response = receiptService.updateReceiptItem(receiptItemId, request, userId);
+
+        return ResponseEntity.ok(
+                ApiResponse.success(SuccessMessage.UPDATE_RECEIPT_ITEM_SUCCESS.getMessage(), response)
+        );
+    }
 }

src/main/java/com/almang/inventory/receipt/dto/response/ReceiptItemResponse.java

@@ -11,6 +11,7 @@ public record ReceiptItemResponse(
         BigDecimal measuredWeight,
         BigDecimal expectedQuantity,
         Integer actualQuantity,
+        Integer unitPrice,
         Integer amount,
         BigDecimal errorRate,
         String note
@@ -24,6 +25,7 @@ public static ReceiptItemResponse from(ReceiptItem receiptItem) {
                 receiptItem.getMeasuredWeight(),
                 receiptItem.getExpectedQuantity(),
                 receiptItem.getActualQuantity(),
+                receiptItem.getUnitPrice(),
                 receiptItem.getAmount(),
                 receiptItem.getErrorRate(),
                 receiptItem.getNote()

src/main/java/com/almang/inventory/receipt/service/ReceiptService.java

@@ -157,6 +157,26 @@ public ReceiptItemResponse getReceiptItem(Long receiptItemId, Long userId) {
         return ReceiptItemResponse.from(receiptItem);
     }
 
+    @Transactional
+    public ReceiptItemResponse updateReceiptItem(Long receiptItemId, UpdateReceiptItemRequest request, Long userId) {
+        User user = findUserById(userId);
+        Store store = user.getStore();
+
+        log.info("[ReceiptService] 입고 아이템 수정 요청 - userId: {}, storeId: {}", userId, store.getId());
+        Receipt receipt = findReceiptByIdAndValidateAccess(request.receiptId(), store);
+        ReceiptItem receiptItem = findReceiptItemByIdAndValidateAccess(receiptItemId, receipt);
+
+        receiptItem.update(
+                request.boxCount(), request.measuredWeight(),
+                request.expectedQuantity(), request.actualQuantity(),
+                request.unitPrice(), request.note()
+        );
+        receipt.updateTotalBoxCount(calculateTotalBoxCount(receipt.getItems()));
+
+        log.info("[ReceiptService] 입고 아이템 수정 성공 - receiptItemId: {}", receiptItem.getId());
+        return ReceiptItemResponse.from(receiptItem);
+    }
+
     private List<ReceiptItem> createReceiptItemsFromOrder(Order order) {
         List<ReceiptItem> items = new ArrayList<>();