diff --git a/inventory-web/src/views/operation/scrap/create.vue b/inventory-web/src/views/operation/scrap/create.vue
index a0fc30f..de44813 100644
--- a/inventory-web/src/views/operation/scrap/create.vue
+++ b/inventory-web/src/views/operation/scrap/create.vue
@@ -305,32 +305,80 @@ const scanScannedQty = computed(() =>
 const scanScannedTypes = computed(() => cartItems.value.length)
 const scanTotalTypes = computed(() => plannedItems.value.length)
 
-// --- 按 (source_table, stock_id) 匹配计划项 ---
-const matchPlan = (sourceTable: string, stockId: any) =>
-  plannedItems.value.find(
-    (p: any) => String(p.source_table) === String(sourceTable) && String(p.stock_id) === String(stockId)
-  )
+// ============================================================
+// ★ SKU 主键匹配（与后端 _match_key 完全同口径）
+//
+// SKU 在同一库存表内唯一、且不存在跨表重名，故以 SKU 作为扫码匹配的唯一标识。
+// 个别历史库存行 SKU 为空，这类行回退为 source_table + stock_id 复合键；
+// 前缀区分（sku: / row:）确保空 SKU 行绝不会与正常 SKU 串键。
+// ============================================================
+const normSku = (sku: any) => String(sku ?? '').trim()
 
-// 某计划项已扫数量
-const scannedQtyOf = (plan: any) =>
+const matchKey = (sourceTable: any, stockId: any, sku: any) => {
+  const s = normSku(sku)
+  return s ? `sku:${s}` : `row:${String(sourceTable)}#${String(stockId)}`
+}
+
+// 按匹配键找批准明细行
+const findPlanByKey = (key: string) =>
+  plannedItems.value.find((p: any) => matchKey(p.source_table, p.stock_id, p.sku) === key)
+
+// 某匹配键的批准总量（同一 SKU 在批准单中出现多行时累加）
+const approvedQtyByKey = (key: string) =>
+  plannedItems.value
+    .filter((p: any) => matchKey(p.source_table, p.stock_id, p.sku) === key)
+    .reduce((sum: number, p: any) => sum + (Number(p.scrap_qty) || 0), 0)
+
+// 某匹配键在购物车中的已扫总量
+const scannedQtyByKey = (key: string) =>
   cartItems.value
-    .filter(ci => String(ci.source_table) === String(plan.source_table)
-               && String(ci.stock_id) === String(plan.stock_id))
-    .reduce((sum, ci) => sum + (Number(ci.scrap_quantity) || 0), 0)
+    .filter((ci: any) => matchKey(ci.source_table, ci.id, ci.sku) === key)
+    .reduce((sum: number, ci: any) => sum + (Number(ci.scrap_quantity) || 0), 0)
 
-// 购物车某行还能再报废多少（批准量 - 其余行已占用量）
+// 展示用：计划行的已扫数量
+const scannedQtyOf = (plan: any) =>
+  scannedQtyByKey(matchKey(plan.source_table, plan.stock_id, plan.sku))
+
+// 购物车某行还能再报废多少（该 SKU 批准量 - 其余行已占用量，且不超当前可用库存）
 const maxScrapFor = (row: any) => {
-  const plan = matchPlan(row.source_table, row.stock_id)
-  const approved = Number(plan?.scrap_qty) || 0
+  const key = matchKey(row.source_table, row.id, row.sku)
+  const approved = approvedQtyByKey(key)
   const others = cartItems.value
-    .filter(ci => ci !== row
-      && String(ci.source_table) === String(row.source_table)
-      && String(ci.stock_id) === String(row.stock_id))
-    .reduce((sum, ci) => sum + (Number(ci.scrap_quantity) || 0), 0)
+    .filter((ci: any) => ci !== row && matchKey(ci.source_table, ci.id, ci.sku) === key)
+    .reduce((sum: number, ci: any) => sum + (Number(ci.scrap_quantity) || 0), 0)
   const avail = parseFloat(row.available_quantity) || 0
   return Math.max(0, Math.min(approved - others, avail))
 }
 
+/**
+ * ★ 扫码校验（SKU 主键）
+ *
+ * 返回 null 表示放行；返回字符串表示拦截原因（调用方以红色 toast 提示并阻断入车）。
+ *   · 扫码 SKU 不在批准明细中 → 拦截
+ *   · 该 SKU 累计扫码量 + 本次数量 > 批准量 → 拦截
+ */
+const validateAgainstPlan = (item: any, addQty: number): string | null => {
+  const key = matchKey(item.source_table, item.id, item.sku)
+  const plan = findPlanByKey(key)
+
+  if (!plan) {
+    const s = normSku(item.sku)
+    return s
+      ? `SKU【${s}】不在该报废申请单的批准明细中，禁止报废`
+      : `该物料【${item.name || ''}】不在申请单的批准明细中，禁止报废`
+  }
+
+  const approved = approvedQtyByKey(key)
+  const already = scannedQtyByKey(key)
+
+  if (already + addQty > approved) {
+    const label = normSku(plan.sku) || plan.name || ''
+    return `SKU【${label}】超出批准数量（批准: ${approved}，已扫: ${already}，本次: ${addQty}）`
+  }
+
+  return null
+}
+
 // 未扫清单
 const unscannedList = computed(() =>
   plannedItems.value.map((plan: any) => {
@@ -385,27 +433,6 @@ const handleRequestChange = (val: number | null) => {
   barcodeInput.value = ''
 }
 
-/**
- * 校验扫码物品是否属于本申请单的批准明细，且累计不超批准量。
- * 返回 null 表示通过，否则返回错误文案。
- */
-const validateAgainstPlan = (item: any, addQty: number): string | null => {
-  const plan = matchPlan(item.source_table, item.id)
-
-  if (!plan) {
-    return `该物料【${item.name || item.sku}】不在申请单的批准明细中，禁止报废`
-  }
-
-  const approved = Number(plan.scrap_qty) || 0
-  const alreadyScanned = scannedQtyOf(plan)
-
-  if (alreadyScanned + addQty > approved) {
-    return `【${plan.name || plan.sku}】超出批准数量（批准: ${approved}，已扫: ${alreadyScanned}，本次: ${addQty}）`
-  }
-
-  return null
-}
-
 // --- 扫码逻辑 ---
 const onScanSuccess = (code: string) => {
   if (!code) return
@@ -444,10 +471,9 @@ const handleManualInput = async () => {
   try {
     loading.value = true
 
-    // 1. 购物车已有该库存行 → 累加（按 source_table + id 去重，与申请单明细同口径）
+    // 1. 购物车已有该 SKU → 累加（与批准明细同口径，按 SKU 去重）
     const existIndex = cartItems.value.findIndex(
-      item => String(item.source_table) === String(item.source_table) &&
-              (item.barcode === code || item.sku === code || String(item.id) === String(code))
+      item => normSku(item.sku) === code || item.barcode === code || String(item.id) === code
     )
     if (existIndex > -1) {
       const item = cartItems.value[existIndex]