diff --git a/B05_Profile/B05_Profile_UI_Structures_Panel_Types.ts b/B05_Profile/B05_Profile_UI_Structures_Panel_Types.ts
index 36db77ddf..2e4734543 100644
--- a/B05_Profile/B05_Profile_UI_Structures_Panel_Types.ts
+++ b/B05_Profile/B05_Profile_UI_Structures_Panel_Types.ts
@@ -100,6 +100,8 @@ export const DEFAULT_INTERVAL_LENGTH_M = 15;
 
 /** 계곡 통과 시설 1건 — 관 지점 정본에서 온 병합 표시·폼 편집용 항목. */
 export interface PipeFacilityItem {
+  /** 관 고정 id(측점 열쇠 `pipe:<id>` · 옮겨도 그대로 — 초안에 안 실으면 옮긴 측점이 앞 설계를 잃음 · 445 H2). */
+  id?: string | null;
   chainage_m: number;
   facility: PipeFacility;
   start_m?: number;
diff --git a/B06_Section/B06_Section_UI_Page_Structures_Panel.ts b/B06_Section/B06_Section_UI_Page_Structures_Panel.ts
index 42d898bde..eef1873f8 100644
--- a/B06_Section/B06_Section_UI_Page_Structures_Panel.ts
+++ b/B06_Section/B06_Section_UI_Page_Structures_Panel.ts
@@ -408,6 +408,7 @@ export function createB06StructuresPanel(deps: B06StructuresPanelDeps): B06Struc
       // 이래야 B05 에서 넣고 B06 으로 넘어와도 같은 목록이 보인다(2026-09-12 사용자).
       const pendingPipes = readPendingPipes(projectId);
       pipeFacilities = (pendingPipes ?? pipeResponse.pipe_points).map((pipe) => ({
+        id: pipe.id, // 측점 열쇠 `pipe:<id>` — 초안까지 들고 감(445 H2)
         chainage_m: pipe.chainage_m,
         facility: pipe.facility ?? "pipe",
         start_m: pipe.start_m,
@@ -496,6 +497,7 @@ export function createB06StructuresPanel(deps: B06StructuresPanelDeps): B06Struc
     writePendingPipes(
       deps.projectId,
       pipeFacilities.map((pipe) => ({
+        ...(pipe.id ? { id: pipe.id } : {}), // B05 초안과 같은 꼴(445 H2)
         chainage_m: pipe.chainage_m,
         source: pipe.source ?? "user",
         facility: pipe.facility,
diff --git a/resources/tester/test_445_save_patch.py b/resources/tester/test_445_save_patch.py
index 5efa33002..c95e83dc8 100644
--- a/resources/tester/test_445_save_patch.py
+++ b/resources/tester/test_445_save_patch.py
@@ -249,3 +249,15 @@ def test_H5_노선_저장_뒤_본문_M7_kindreset_옮김():
     assert 'writeState("kindreset", rekey("revetx", resets), projectId)' in carry
     idle = keys[keys.index("function moveIdleStates") :]
     assert 'writeState("kindreset", move(resets), projectId)' in idle
+
+
+def test_H2_B06_관_폼_초안이_관_id_를_실음():
+    """B06 관 폼이 초안에 관 id 를 빠뜨리면 측점 열쇠가 `pipe:p…` → `pipe:pipe-356.00` 으로 바뀌어
+    옮긴 측점이 앞 설계(지반 · 메모 · 조절)를 잃음 — 화면 실측(관 351 → 356)."""
+    panel = (ROOT / "B06_Section" / "B06_Section_UI_Page_Structures_Panel.ts").read_text(
+        encoding="utf-8"
+    )
+    load = panel[panel.index("pipeFacilities = (pendingPipes ?? pipeResponse.pipe_points)") :]
+    assert "id: pipe.id" in load[:200]
+    persist = panel[panel.index("function persistPipes") :]
+    assert "...(pipe.id ? { id: pipe.id } : {})" in persist[:400]