diff --git a/M02_MasterTemplete/M02_Doc_Sk_Path.py b/M02_MasterTemplete/M02_Doc_Sk_Path.py
index 6d4f3303d..b0dba178b 100644
--- a/M02_MasterTemplete/M02_Doc_Sk_Path.py
+++ b/M02_MasterTemplete/M02_Doc_Sk_Path.py
@@ -145,8 +145,11 @@ def preview(key: str, body: dict) -> dict[str, Any]:
     mine = _basis(doc, body)
     before = current(doc)
     job = body.get("할일") or None
-    after = edited(current(doc, job) if job else before, body, key, doc)
+    was = current(doc, job) if job else before
+    after = edited(was, body, key, doc)
     out = answer(after, mine)
+    if not dim.is_imported(doc):  # 고침으로 새로 읽은 줄 = 지금 값으로 셈 · 저장하면 굳음(826-3)
+        out["사본"]["사본없음"] += len(_rows(after) - _rows(was))
     out |= {"전": dc.money(dsk.run(doc, before)), "후": dc.money(out["셈"])}
     if job == skc.PRICE and not dim.is_imported(doc):
         out["바뀐자원"] = dc.refresh(before)[1]
@@ -158,6 +161,10 @@ def preview(key: str, body: dict) -> dict[str, Any]:
     return json.loads(json.dumps(dc.ml._norm(out), ensure_ascii=False, default=str))
 
 
+def _rows(copy: dict) -> set[str]:
+    return {str(r.get("키")) for r in [*(copy.get("로직") or []), *(copy.get("단가") or [])]}
+
+
 def _basis(doc: dict, body: dict) -> dict:
     """가져온 식 단가기준 바꿈(807-1 · 몸 `단가기준` 엑셀 | 우리) — 그 밖 SK · 빈 값 = 그대로."""
     want = body.get("단가기준")