diff --git a/A00_Common/design/design_view_cross.ts b/A00_Common/design/design_view_cross.ts
index 0fe92a61e..4aaa34321 100644
--- a/A00_Common/design/design_view_cross.ts
+++ b/A00_Common/design/design_view_cross.ts
@@ -57,7 +57,6 @@ import {
 import { createB06StructuresPanel } from "../../B06_Section/B06_Section_UI_Page_Structures_Panel";
 import {
   isWallSelecting,
-  wallOwnerM,
   wireStructureSelection,
 } from "../../B06_Section/B06_Section_UI_Page_Structures_Selection";
 import "../../B06_Section/B06_Section_UI_Style.css";
@@ -393,12 +392,8 @@ export async function mountCrossView(
       releaseCross(); // 카드 다시 누름 = 풀기 한 길(범위 테두리 · 형상까지 · 233-2)
       return;
     }
-    // 찍은 부재가 이미 연 시설이 먼저 — 물넘이 콘크리트가 걸친 연동 관으로 안 감(294-8)
-    const owner = isWallSelecting()
-      ? (wallOwnerM() ?? stationControls.structureSpan.ownerOf(target)?.chainage_m)
-      : undefined;
     const preferred = structuresPanel.preferred() !== null;
-    const opened = structuresPanel.showAtChainage(owner ?? target.chainage_m);
+    const opened = structuresPanel.showAtChainage(structureSelection.formChainageOf(target));
     // 카드 하나 고름 = 그 측점(구조물 id 는 목록 · 알약 · 넘김이 고른 것만 · 189-1)
     const picked = preferred ? opened : { chainageM: opened.chainageM, structureId: null };
     if (!isWallSelecting()) selectDesign(projectId, picked, { from: "b06" });
diff --git a/B06_Section/B06_Section_UI_Page_Structures_Selection.ts b/B06_Section/B06_Section_UI_Page_Structures_Selection.ts
index e742ef5cb..73181ca11 100644
--- a/B06_Section/B06_Section_UI_Page_Structures_Selection.ts
+++ b/B06_Section/B06_Section_UI_Page_Structures_Selection.ts
@@ -5,7 +5,7 @@
  * ========================================================================== */
 
 import { refreshAdjustSlots } from "./B06_Section_UI_Adjust_Dock";
-import type { SectionDetailResponse } from "./B06_Section_Api_Fetch";
+import type { CrossSection, SectionDetailResponse } from "./B06_Section_Api_Fetch";
 import type { StationControls } from "./B06_Section_UI_Page_Station_Controls";
 import type { RevetPick } from "./B06_Section_UI_Cross_Culvert";
 import type { B06StructuresPanel } from "./B06_Section_UI_Page_Structures_Panel";
@@ -28,10 +28,6 @@ export function isWallSelecting(): boolean {
   return wallSelecting;
 }
 
-export function wallOwnerM(): number | null {
-  return wallSelecting ? wallOwner : null;
-}
-
 function markWallSelecting(owner: number | null = null): void {
   wallSelecting = true;
   wallOwner = owner;
@@ -52,7 +48,7 @@ export function wireStructureSelection(
   refreshCard?: (chainageM: number) => void,
   /** 폼에 올린 시설로 보기를 옮김 — 목록에서 고른 길(54-47). */
   reveal?: (chainageM: number) => void,
-): { syncInletStructure: () => void } {
+): { syncInletStructure: () => void; formChainageOf: (target: CrossSection) => number } {
   const ownerChainageOf = (chainageM: number, key?: RevetPick): number => {
     const sectionAt = detail()?.cross_sections.find(
       (entry) => Math.abs(entry.chainage_m - chainageM) < 0.01,
@@ -247,5 +243,11 @@ export function wireStructureSelection(
     // 폼이 이 시설로 갈아 끼워진 뒤에 이식을 다시 돌린다 — 날개벽 칸이 그제야 선다.
     refreshAdjustSlots();
   };
-  return { syncInletStructure };
+  /** 카드 고름이 폼에 올릴 자리 — 찍은 부재가 연 시설 먼저(걸친 연동 관 아님 · 294-8) · 그다음 소유 측점(79-6) ·
+   *  카드만 고르면 그 측점. */
+  const formChainageOf = (target: CrossSection): number =>
+    (wallSelecting
+      ? (wallOwner ?? stationControls.structureSpan.ownerOf(target)?.chainage_m)
+      : undefined) ?? target.chainage_m;
+  return { syncInletStructure, formChainageOf };
 }
diff --git a/resources/tester/helper_294_7_ford_slab_pick.cjs b/resources/tester/helper_294_7_ford_slab_pick.cjs
index dc9ca0321..b09b33ccb 100644
--- a/resources/tester/helper_294_7_ford_slab_pick.cjs
+++ b/resources/tester/helper_294_7_ford_slab_pick.cjs
@@ -251,20 +251,14 @@ const flowPanel = {
   getStructures: () => [],
   selectStructure: () => {},
 };
-SEL.wireStructureSelection(
+const flowWired = SEL.wireStructureSelection(
   flowControls,
   () => ({ cross_sections: flowSections }),
   flowPanel,
   (at, key) => flowLog.push(["remember", at, key]),
 );
-// 카드 고름 리스너(`design_view_cross` setStationSelectListener) 의 폼 자리 고르기 그대로
-const cardSelected = (target) => {
-  const owner = SEL.isWallSelecting()
-    ? (SEL.wallOwnerM() ?? flowControls.structureSpan.ownerOf(target)?.chainage_m)
-    : undefined;
-  flowControls.revetOffset.highlightFor(target);
-  flowPanel.showAtChainage(owner ?? target.chainage_m);
-};
+// 카드 고름 리스너(`design_view_cross` setStationSelectListener) — 폼 자리는 배선이 돌려준 함수 그대로
+const cardSelected = (target) => flowPanel.showAtChainage(flowWired.formChainageOf(target));
 const esc = () => {
   flowPicked = null;
   shown = null;
diff --git a/resources/tester/test_294_7_ford_slab_pick.py b/resources/tester/test_294_7_ford_slab_pick.py
index 8f369ca25..28349da3d 100644
--- a/resources/tester/test_294_7_ford_slab_pick.py
+++ b/resources/tester/test_294_7_ford_slab_pick.py
@@ -114,11 +114,12 @@ def test_배선_카드_고름_리스너():
     with open(
         os.path.join(ROOT, "A00_Common", "design", "design_view_cross.ts"), encoding="utf-8"
     ) as f:
-        cross = " ".join(f.read().split())
-    assert (
-        "const owner = isWallSelecting() ? (wallOwnerM() ?? stationControls.structureSpan.ownerOf(target)?.chainage_m) : undefined;"
-        in cross
-    )
-    assert "structuresPanel.showAtChainage(owner ?? target.chainage_m)" in cross
+        raw = f.read()
+    cross = " ".join(raw.split())
+    assert "structuresPanel.showAtChainage(structureSelection.formChainageOf(target))" in cross
+    assert len(raw.splitlines()) <= 685  # 233-2 · 233-3 · 298 한도
     sel = _read("B06_Section_UI_Page_Structures_Selection.ts")
+    assert "(wallOwner ?? stationControls.structureSpan.ownerOf(target)?.chainage_m)" in " ".join(
+        sel.split()
+    )
     assert "if (!born || chainageM === null || opening) return;" in sel