Return Chinese HTTP 400 for missing stock UOM and block mixed-UOM lots.

App and Liquibase BEFORE triggers reject one lot spanning two stock-UOM buckets so API/UI match M-X-01 and M-E-01.

src/main/java/com/ffii/fpsms/modules/stock/service/InventoryLotLineService.kt

@@ -25,8 +25,10 @@ import net.sf.jasperreports.engine.JasperCompileManager
 import org.springframework.core.io.ClassPathResource
 import org.springframework.data.domain.PageRequest
 import java.time.LocalDate
+import org.springframework.http.HttpStatus
 import org.springframework.stereotype.Service
 import org.springframework.transaction.annotation.Transactional
+import org.springframework.web.server.ResponseStatusException
 import java.io.FileNotFoundException
 import java.io.IOException
 import java.math.BigDecimal
@@ -190,7 +192,21 @@ open class InventoryLotLineService(
         val stockUom = request.stockUomId?.let { itemUomRespository.findById(it).getOrNull() }
             ?: existing?.stockUom
         if (stockUom == null) {
-            throw IllegalArgumentException("stockItemUomId is required for inventory_lot_line")
+            throw ResponseStatusException(HttpStatus.BAD_REQUEST, "入倉明細缺少庫存單位，無法入帳")
+        }
+        // M-E-01: one inventory lot must not mix two stock-UOM buckets (item_uom.uomId).
+        val lotId = inventoryLot?.id ?: existing?.inventoryLot?.id
+        val newBucketUomId = stockUom.uom?.id
+        if (lotId != null && newBucketUomId != null) {
+            val conflict = inventoryLotLineRepository.findAllByInventoryLotId(lotId).any { sibling ->
+                sibling.deleted != true &&
+                    sibling.id != existing?.id &&
+                    sibling.stockUom?.uom?.id != null &&
+                    sibling.stockUom!!.uom!!.id != newBucketUomId
+            }
+            if (conflict) {
+                throw ResponseStatusException(HttpStatus.BAD_REQUEST, "同一批次不可混用不同庫存單位")
+            }
         }
         val status = request.status?.let { _status -> InventoryLotLineStatus.entries.find { it.value == _status } }
 

src/main/java/com/ffii/fpsms/modules/stock/service/InventoryService.kt

@@ -25,7 +25,9 @@ import org.apache.poi.ss.usermodel.Sheet
 import org.apache.poi.ss.usermodel.Workbook
 import org.apache.poi.xssf.usermodel.XSSFWorkbook
 import org.springframework.core.io.support.PathMatchingResourcePatternResolver
+import org.springframework.http.HttpStatus
 import org.springframework.stereotype.Service
+import org.springframework.web.server.ResponseStatusException
 import java.math.BigDecimal
 import java.sql.Timestamp
 import java.time.LocalDate
@@ -649,8 +651,9 @@ open class InventoryService(
             val warehouse = warehouseRepository.findAll().find { it.code == request.warehouseCode }!!
 //            val salesUnit = itemUomService.findSalesUnitByItemId(itemId = inventoryLot.item!!.id!!)
             val stockUnit = itemUomService.findStockUnitByItemId(itemId = inventoryLot.item!!.id!!)
-                ?: throw IllegalArgumentException(
-                    "stockItemUomId is required: no stockUnit item_uom for itemId=${inventoryLot.item!!.id}",
+                ?: throw ResponseStatusException(
+                    HttpStatus.BAD_REQUEST,
+                    "入倉明細缺少庫存單位，無法入帳",
                 )
             // ChangeList #8: lot-line stockItemUomId must be set so trigger writes inventory.stockUomId.
             InventoryLotLine().apply {

src/main/java/com/ffii/fpsms/modules/stock/service/StockInLineService.kt

@@ -539,8 +539,9 @@ open class StockInLineService(
                         this.inQty = convertedBaseQty
                         this.status = InventoryLotLineStatus.AVAILABLE
                         this.stockUom = stockItemUom
-                            ?: throw IllegalArgumentException(
-                                "stockItemUomId is required: no stockUnit item_uom for itemId=${request.itemId}",
+                            ?: throw ResponseStatusException(
+                                HttpStatus.BAD_REQUEST,
+                                "入倉明細缺少庫存單位，無法入帳",
                             )
                     }
                     saveLines.add(inventoryLotLine)
@@ -1535,9 +1536,9 @@ open class StockInLineService(
                 )
         }
         return itemUomRepository.findFirstByItemIdAndStockUnitIsTrueAndDeletedIsFalseOrderByIdAsc(itemId)
-            ?: throw IllegalArgumentException(
-                "Stock UOM not found for item: id=$itemId, itemNo=$itemNo. " +
-                    "Ensure at least one item_uom row has stockUnit=1, deleted=0 for this item."
+            ?: throw ResponseStatusException(
+                HttpStatus.BAD_REQUEST,
+                "入倉明細缺少庫存單位，無法入帳",
             )
     }
 

src/main/resources/db/changelog/changes/20260910_inventory_stock_uom/07_one_lot_one_stock_uom.sql

@@ -0,0 +1,56 @@
+-- liquibase formatted sql
+
+-- changeset kelvin:20260922-ill-before-insert-one-lot-one-stock-uom splitStatements:false
+-- comment: M-E-01 One inventory_lot must not mix two stock UOM buckets.
+DROP TRIGGER IF EXISTS `inventory_lot_line_BEFORE_insert_one_stock_uom`;
+CREATE DEFINER = CURRENT_USER TRIGGER `inventory_lot_line_BEFORE_insert_one_stock_uom`
+    BEFORE INSERT
+    ON `inventory_lot_line`
+    FOR EACH ROW
+BEGIN
+    IF NEW.stockItemUomId IS NOT NULL
+        AND NEW.inventoryLotId IS NOT NULL
+        AND IFNULL(NEW.deleted, 0) = 0
+        AND EXISTS (
+            SELECT 1
+            FROM `inventory_lot_line` ill
+                     INNER JOIN `item_uom` iu_old
+                                ON iu_old.id = ill.stockItemUomId AND IFNULL(iu_old.deleted, 0) = 0
+                     INNER JOIN `item_uom` iu_new
+                                ON iu_new.id = NEW.stockItemUomId AND IFNULL(iu_new.deleted, 0) = 0
+            WHERE ill.inventoryLotId = NEW.inventoryLotId
+              AND IFNULL(ill.deleted, 0) = 0
+              AND iu_old.uomId <> iu_new.uomId
+        ) THEN
+        SIGNAL SQLSTATE '45000'
+            SET MESSAGE_TEXT = '同一批次不可混用不同庫存單位';
+    END IF;
+END;
+
+-- changeset kelvin:20260922-ill-before-update-one-lot-one-stock-uom splitStatements:false
+-- comment: M-E-01 Also block UPDATE that would mix stock UOMs on the same lot.
+DROP TRIGGER IF EXISTS `inventory_lot_line_BEFORE_update_one_stock_uom`;
+CREATE DEFINER = CURRENT_USER TRIGGER `inventory_lot_line_BEFORE_update_one_stock_uom`
+    BEFORE UPDATE
+    ON `inventory_lot_line`
+    FOR EACH ROW
+BEGIN
+    IF NEW.stockItemUomId IS NOT NULL
+        AND NEW.inventoryLotId IS NOT NULL
+        AND IFNULL(NEW.deleted, 0) = 0
+        AND EXISTS (
+            SELECT 1
+            FROM `inventory_lot_line` ill
+                     INNER JOIN `item_uom` iu_old
+                                ON iu_old.id = ill.stockItemUomId AND IFNULL(iu_old.deleted, 0) = 0
+                     INNER JOIN `item_uom` iu_new
+                                ON iu_new.id = NEW.stockItemUomId AND IFNULL(iu_new.deleted, 0) = 0
+            WHERE ill.inventoryLotId = NEW.inventoryLotId
+              AND IFNULL(ill.deleted, 0) = 0
+              AND ill.id <> NEW.id
+              AND iu_old.uomId <> iu_new.uomId
+        ) THEN
+        SIGNAL SQLSTATE '45000'
+            SET MESSAGE_TEXT = '同一批次不可混用不同庫存單位';
+    END IF;
+END;