diff --git a/frontend/app/(main)/COMPANY_10/production/work-instruction/page.tsx b/frontend/app/(main)/COMPANY_10/production/work-instruction/page.tsx
index 8e474428..5d51b29f 100644
--- a/frontend/app/(main)/COMPANY_10/production/work-instruction/page.tsx
+++ b/frontend/app/(main)/COMPANY_10/production/work-instruction/page.tsx
@@ -69,6 +69,9 @@ interface SelectedItem {
   // 기준수(BOM 0레벨 base_qty) / 배치수(자동) / 배분(균등|순차)
   baseQty?: number | null;
   splitMode?: "even" | "sequential";
+  // 수정 모드: 기존 detail row 식별 + 잠금 상태
+  detailId?: string;
+  locked?: boolean;
 }
 
 // 배치수 산출: baseQty>0 && qty>baseQty면 ceil(qty/baseQty), 아니면 1
@@ -458,6 +461,9 @@ export default function WorkInstructionPage() {
       equipmentIds: (d.detail_equipment_ids || "").split(",").filter(Boolean),
       workTeams: (d.detail_work_teams || "").split(",").filter(Boolean),
       workers: (d.detail_workers || "").split(",").filter(Boolean),
+      // 잠금 상태 (생산실적 있음) + 기존 detail row 식별자
+      detailId: d.detail_id,
+      locked: d.is_locked === true,
     }));
     setEditItems(items);
     setAddQty(""); setAddEquipment(""); setAddWorkTeam(""); setAddWorker("");
diff --git a/frontend/app/(main)/COMPANY_16/production/work-instruction/page.tsx b/frontend/app/(main)/COMPANY_16/production/work-instruction/page.tsx
index 1f922fe6..c82f3f04 100644
--- a/frontend/app/(main)/COMPANY_16/production/work-instruction/page.tsx
+++ b/frontend/app/(main)/COMPANY_16/production/work-instruction/page.tsx
@@ -69,6 +69,9 @@ interface SelectedItem {
   // 기준수(BOM 0레벨 base_qty) / 배치수(자동) / 배분(균등|순차)
   baseQty?: number | null;
   splitMode?: "even" | "sequential";
+  // 수정 모드: 기존 detail row 식별 + 잠금 상태
+  detailId?: string;
+  locked?: boolean;
 }
 
 // 배치수 산출: baseQty>0 && qty>baseQty면 ceil(qty/baseQty), 아니면 1
@@ -462,6 +465,9 @@ export default function WorkInstructionPage() {
       equipmentIds: (d.detail_equipment_ids || "").split(",").filter(Boolean),
       workTeams: (d.detail_work_teams || "").split(",").filter(Boolean),
       workers: (d.detail_workers || "").split(",").filter(Boolean),
+      // 잠금 상태 (생산실적 있음) + 기존 detail row 식별자
+      detailId: d.detail_id,
+      locked: d.is_locked === true,
     }));
     setEditItems(items);
     setAddQty(""); setAddEquipment(""); setAddWorkTeam(""); setAddWorker("");
diff --git a/frontend/app/(main)/COMPANY_28/production/work-instruction/page.tsx b/frontend/app/(main)/COMPANY_28/production/work-instruction/page.tsx
index 102a6356..5467799c 100644
--- a/frontend/app/(main)/COMPANY_28/production/work-instruction/page.tsx
+++ b/frontend/app/(main)/COMPANY_28/production/work-instruction/page.tsx
@@ -69,6 +69,9 @@ interface SelectedItem {
   // 기준수(BOM 0레벨 base_qty) / 배치수(자동) / 배분(균등|순차)
   baseQty?: number | null;
   splitMode?: "even" | "sequential";
+  // 수정 모드: 기존 detail row 식별 + 잠금 상태
+  detailId?: string;
+  locked?: boolean;
 }
 
 // 배치수 산출: baseQty>0 && qty>baseQty면 ceil(qty/baseQty), 아니면 1
@@ -458,6 +461,9 @@ export default function WorkInstructionPage() {
       equipmentIds: (d.detail_equipment_ids || "").split(",").filter(Boolean),
       workTeams: (d.detail_work_teams || "").split(",").filter(Boolean),
       workers: (d.detail_workers || "").split(",").filter(Boolean),
+      // 잠금 상태 (생산실적 있음) + 기존 detail row 식별자
+      detailId: d.detail_id,
+      locked: d.is_locked === true,
     }));
     setEditItems(items);
     setAddQty(""); setAddEquipment(""); setAddWorkTeam(""); setAddWorker("");
diff --git a/frontend/app/(main)/COMPANY_29/production/work-instruction/page.tsx b/frontend/app/(main)/COMPANY_29/production/work-instruction/page.tsx
index 102a6356..5467799c 100644
--- a/frontend/app/(main)/COMPANY_29/production/work-instruction/page.tsx
+++ b/frontend/app/(main)/COMPANY_29/production/work-instruction/page.tsx
@@ -69,6 +69,9 @@ interface SelectedItem {
   // 기준수(BOM 0레벨 base_qty) / 배치수(자동) / 배분(균등|순차)
   baseQty?: number | null;
   splitMode?: "even" | "sequential";
+  // 수정 모드: 기존 detail row 식별 + 잠금 상태
+  detailId?: string;
+  locked?: boolean;
 }
 
 // 배치수 산출: baseQty>0 && qty>baseQty면 ceil(qty/baseQty), 아니면 1
@@ -458,6 +461,9 @@ export default function WorkInstructionPage() {
       equipmentIds: (d.detail_equipment_ids || "").split(",").filter(Boolean),
       workTeams: (d.detail_work_teams || "").split(",").filter(Boolean),
       workers: (d.detail_workers || "").split(",").filter(Boolean),
+      // 잠금 상태 (생산실적 있음) + 기존 detail row 식별자
+      detailId: d.detail_id,
+      locked: d.is_locked === true,
     }));
     setEditItems(items);
     setAddQty(""); setAddEquipment(""); setAddWorkTeam(""); setAddWorker("");
diff --git a/frontend/app/(main)/COMPANY_31/production/work-instruction/page.tsx b/frontend/app/(main)/COMPANY_31/production/work-instruction/page.tsx
index fd0a77c1..b47504dc 100644
--- a/frontend/app/(main)/COMPANY_31/production/work-instruction/page.tsx
+++ b/frontend/app/(main)/COMPANY_31/production/work-instruction/page.tsx
@@ -69,6 +69,9 @@ interface SelectedItem {
   // 기준수(BOM 0레벨 base_qty) / 배치수(자동) / 배분(균등|순차)
   baseQty?: number | null;
   splitMode?: "even" | "sequential";
+  // 수정 모드: 기존 detail row 식별 + 잠금 상태
+  detailId?: string;
+  locked?: boolean;
 }
 
 // 배치수 산출: baseQty>0 && qty>baseQty면 ceil(qty/baseQty), 아니면 1
@@ -471,6 +474,9 @@ export default function WorkInstructionPage() {
       equipmentIds: (d.detail_equipment_ids || "").split(",").filter(Boolean),
       workTeams: (d.detail_work_teams || "").split(",").filter(Boolean),
       workers: (d.detail_workers || "").split(",").filter(Boolean),
+      // 잠금 상태 (생산실적 있음) + 기존 detail row 식별자
+      detailId: d.detail_id,
+      locked: d.is_locked === true,
     }));
     setEditItems(items);
     setAddQty(""); setAddEquipment(""); setAddWorkTeam(""); setAddWorker("");
diff --git a/frontend/app/(main)/COMPANY_8/production/work-instruction/page.tsx b/frontend/app/(main)/COMPANY_8/production/work-instruction/page.tsx
index 8e474428..5d51b29f 100644
--- a/frontend/app/(main)/COMPANY_8/production/work-instruction/page.tsx
+++ b/frontend/app/(main)/COMPANY_8/production/work-instruction/page.tsx
@@ -69,6 +69,9 @@ interface SelectedItem {
   // 기준수(BOM 0레벨 base_qty) / 배치수(자동) / 배분(균등|순차)
   baseQty?: number | null;
   splitMode?: "even" | "sequential";
+  // 수정 모드: 기존 detail row 식별 + 잠금 상태
+  detailId?: string;
+  locked?: boolean;
 }
 
 // 배치수 산출: baseQty>0 && qty>baseQty면 ceil(qty/baseQty), 아니면 1
@@ -458,6 +461,9 @@ export default function WorkInstructionPage() {
       equipmentIds: (d.detail_equipment_ids || "").split(",").filter(Boolean),
       workTeams: (d.detail_work_teams || "").split(",").filter(Boolean),
       workers: (d.detail_workers || "").split(",").filter(Boolean),
+      // 잠금 상태 (생산실적 있음) + 기존 detail row 식별자
+      detailId: d.detail_id,
+      locked: d.is_locked === true,
     }));
     setEditItems(items);
     setAddQty(""); setAddEquipment(""); setAddWorkTeam(""); setAddWorker("");
diff --git a/frontend/app/(main)/COMPANY_9/production/work-instruction/page.tsx b/frontend/app/(main)/COMPANY_9/production/work-instruction/page.tsx
index 7cb6ab2e..2905adc7 100644
--- a/frontend/app/(main)/COMPANY_9/production/work-instruction/page.tsx
+++ b/frontend/app/(main)/COMPANY_9/production/work-instruction/page.tsx
@@ -66,6 +66,9 @@ interface SelectedItem {
   equipmentIds?: string[];
   workTeams?: string[];
   workers?: string[];
+  // 수정 모드: 기존 detail row 식별 + 잠금 상태
+  detailId?: string;
+  locked?: boolean;
 }
 
 // 공용 다중선택 Popover 컴포넌트 (설비/작업조/작업자에 재사용)
@@ -420,6 +423,9 @@ export default function WorkInstructionPage() {
       equipmentIds: (d.detail_equipment_ids || "").split(",").filter(Boolean),
       workTeams: (d.detail_work_teams || "").split(",").filter(Boolean),
       workers: (d.detail_workers || "").split(",").filter(Boolean),
+      // 잠금 상태 (생산실적 있음) + 기존 detail row 식별자
+      detailId: d.detail_id,
+      locked: d.is_locked === true,
     }));
     setEditItems(items);
     setAddQty(""); setAddEquipment(""); setAddWorkTeam(""); setAddWorker("");