diff --git a/src/app/(main)/m/admin/procurements/new/page.tsx b/src/app/(main)/m/admin/procurements/new/page.tsx
index aa2f483..76b1dc2 100644
--- a/src/app/(main)/m/admin/procurements/new/page.tsx
+++ b/src/app/(main)/m/admin/procurements/new/page.tsx
@@ -4,6 +4,7 @@ import { useEffect, useState } from "react";
 import { useRouter } from "next/navigation";
 import { Trash2, Plus } from "lucide-react";
 import Swal from "sweetalert2";
+import { SearchableSelect } from "@/components/ui/searchable-select";
 
 interface Vendor { OBJID: string; VENDOR_NAME: string }
 interface Item { OBJID: string; ITEM_CODE: string; ITEM_NAME: string; COST_PRICE: number }
@@ -58,10 +59,14 @@ export default function NewProcPage() {
         <div className="grid grid-cols-2 gap-3">
           <div>
             <label className="text-xs font-semibold text-slate-600">공급업체 *</label>
-            <select value={vendorObjid} onChange={(e) => setVendorObjid(e.target.value)} className="w-full h-10 px-3 rounded-lg border border-slate-200 mt-1">
-              <option value="">선택</option>
-              {vendors.map((v) => <option key={v.OBJID} value={v.OBJID}>{v.VENDOR_NAME}</option>)}
-            </select>
+            <div className="mt-1">
+              <SearchableSelect
+                value={vendorObjid}
+                onChange={setVendorObjid}
+                options={vendors.map((v) => ({ value: v.OBJID, label: v.VENDOR_NAME }))}
+                placeholder="공급업체 검색/선택"
+              />
+            </div>
           </div>
           <div>
             <label className="text-xs font-semibold text-slate-600">발주일</label>
diff --git a/src/app/(main)/m/admin/procurements/page.tsx b/src/app/(main)/m/admin/procurements/page.tsx
index da1e8d2..9a478e5 100644
--- a/src/app/(main)/m/admin/procurements/page.tsx
+++ b/src/app/(main)/m/admin/procurements/page.tsx
@@ -352,8 +352,9 @@ function ProcurementForm({ detail, vendors, onSetVendor, onSetMemo, onSetTerm, o
   onUpdateLine: (line: { objid?: string; itemObjid?: string; qty: number; costPrice: number }) => void;
   onDeleteLine: (objid: string) => void;
 }) {
-  // 입금완료(PAID)/취소(CANCELLED) 전까지 수정 허용 — 발주요청/입고완료/부분입고 도 수량 수정 가능
-  const editable = !["PAID", "CANCELLED"].includes(detail.proc.STATUS);
+  // OPEN(작성중) / REQUESTED(발주요청) 만 수정 가능.
+  // RECEIVED(입고완료) / PARTIAL(부분입고) / PAID(입금완료) / CANCELLED 는 수정 불가.
+  const editable = ["OPEN", "REQUESTED"].includes(detail.proc.STATUS);
   const formRef = useRef<HTMLDivElement>(null);
 
   const handleCapture = async () => {
@@ -419,12 +420,14 @@ function ProcurementForm({ detail, vendors, onSetVendor, onSetMemo, onSetTerm, o
             <th className="border border-slate-400 bg-slate-100 px-2 py-1 text-center">공급업체</th>
             <td className="border border-slate-400 px-3 py-1">
               {editable ? (
-                <select value={detail.proc.VENDOR_OBJID ?? ""}
-                  onChange={(e) => onSetVendor(e.target.value)}
-                  className="h-7 px-2 rounded border border-slate-300 text-[11px] bg-white">
-                  <option value="">-- 공급업체 선택 --</option>
-                  {vendors.map((v) => <option key={v.OBJID} value={v.OBJID}>{v.VENDOR_NAME}</option>)}
-                </select>
+                <div className="max-w-[280px]">
+                  <SearchableSelect
+                    value={detail.proc.VENDOR_OBJID ?? ""}
+                    onChange={onSetVendor}
+                    options={vendors.map((v) => ({ value: v.OBJID, label: v.VENDOR_NAME }))}
+                    placeholder="공급업체 검색/선택"
+                  />
+                </div>
               ) : (
                 <span className="font-semibold">{detail.proc.VENDOR_NAME ?? "-"}</span>
               )}
diff --git a/src/app/api/m/procurements/lines/save/route.ts b/src/app/api/m/procurements/lines/save/route.ts
index 5ba2a2c..54015ac 100644
--- a/src/app/api/m/procurements/lines/save/route.ts
+++ b/src/app/api/m/procurements/lines/save/route.ts
@@ -34,10 +34,10 @@ export async function POST(req: NextRequest) {
       return NextResponse.json({ success: false, message: "발주서를 찾을 수 없습니다." }, { status: 404 });
     }
     const status = procRes.rows[0].status;
-    // 입금완료(PAID)/취소(CANCELLED) 외 모든 상태에서 수정 허용
-    if (status === "PAID" || status === "CANCELLED") {
+    // OPEN/REQUESTED 만 허용. 입고완료/부분입고/입금완료/취소는 차단.
+    if (status !== "OPEN" && status !== "REQUESTED") {
       await client.query("ROLLBACK");
-      return NextResponse.json({ success: false, message: "입금완료/취소 상태는 수정할 수 없습니다." }, { status: 400 });
+      return NextResponse.json({ success: false, message: "입고완료 이후 상태는 수정할 수 없습니다." }, { status: 400 });
     }
 
     for (const ln of lines) {