diff --git a/resources/tester/test_est_escalation_workflow.py b/resources/tester/test_est_escalation_workflow.py
index 36ed614c1..fc0dfaca0 100644
--- a/resources/tester/test_est_escalation_workflow.py
+++ b/resources/tester/test_est_escalation_workflow.py
@@ -1,6 +1,23 @@
 from test_est_rea_parity import run
 
 
+def test_progress_exclusions_preserve_new_rows_and_reject_ambiguous_keys():
+    result = run(
+        "math",
+        """(()=>{
+      const p=EstNative.empty();p.tables.EstMainDat=[{PkID:1,Code:'A',EscProgress:9},
+        {PkID:2,Code:'B',EscProgress:7}];
+      const before=JSON.stringify(p), saved={rows:[{PkID:1,Code:'A',TotalGN:3}]};
+      const updates=EstBusiness.progressExclusions(p,saved);let blocked=0;
+      try{EstBusiness.progressExclusions(p,{rows:[{Code:'A',TotalGN:1},{Code:'A',TotalGN:2}]})}catch{blocked++}
+      const q=structuredClone(p);q.tables.EstMainDat=[{Code:'A'},{Code:'A'}];
+      try{EstBusiness.progressExclusions(q,{rows:[{Code:'A',TotalGN:1}]})}catch{blocked++}
+      return {updates,blocked,same:before===JSON.stringify(p)};
+    })()""",
+    )
+    assert result == {"updates": [{"index": 0, "value": 3}], "blocked": 2, "same": True}
+
+
 def test_escalation_preserves_explicit_zero_total_and_falls_back_only_without_wonga():
     result = run(
         "math",
diff --git a/tools/est-test/native-business-actions.js b/tools/est-test/native-business-actions.js
index 677087634..69eb997f7 100644
--- a/tools/est-test/native-business-actions.js
+++ b/tools/est-test/native-business-actions.js
@@ -142,17 +142,14 @@ const EstBusinessActions = (() => {
             choices: locked.map((round) => [round.id, round.name]),
           },
         ],
-        (values) =>
+        (values) => {
+          const result = locked.find((round) => round.id === values.id).result;
+          const updates = EstBusiness.progressExclusions(project, result);
           EstApp.change(() => {
-            const result = locked.find((round) => round.id === values.id).result;
-            const rows = new Map(
-              result.rows.map((row, index) => [EstBusiness.rowKey(row, index), row]),
-            );
-            project.tables.EstMainDat.forEach(
-              (row, index) =>
-                (row.EscProgress = Number(rows.get(EstBusiness.rowKey(row, index))?.TotalGN) || 0),
-            );
-          }, false),
+            for (const { index, value } of updates)
+              project.tables.EstMainDat[index].EscProgress = value;
+          }, false);
+        },
       );
     } else if (name === "load-contract" || name === "load-bid") {
       purpose = name;
diff --git a/tools/est-test/native-business.js b/tools/est-test/native-business.js
index f1956775a..b6c999b48 100644
--- a/tools/est-test/native-business.js
+++ b/tools/est-test/native-business.js
@@ -4,6 +4,27 @@ const EstBusiness = (() => {
   const copy = (value) => structuredClone(value);
   const rowKey = (row, index) => String(row.PkID ?? (row.Code || `row:${index}`));
   const special = (row) => [57, 58, 62, 67].includes(num(row.LinkIndex));
+  function progressExclusions(project, result) {
+    const saved = new Map();
+    result.rows.forEach((row, index) => {
+      const key = rowKey(row, index);
+      if (saved.has(key)) throw Error(`기성 내역 식별자가 중복됩니다: ${key}`);
+      const value = Number(row.TotalGN);
+      if (!Number.isFinite(value)) throw Error(`기성 누계수량 오류: ${key}`);
+      saved.set(key, value);
+    });
+    const counts = new Map();
+    project.tables.EstMainDat.forEach((row, index) => {
+      const key = rowKey(row, index);
+      counts.set(key, (counts.get(key) || 0) + 1);
+    });
+    return project.tables.EstMainDat.flatMap((row, index) => {
+      const key = rowKey(row, index);
+      if (!saved.has(key)) return [];
+      if (counts.get(key) !== 1) throw Error(`현재 내역 식별자가 중복됩니다: ${key}`);
+      return [{ index, value: saved.get(key) }];
+    });
+  }
   function moveEstimateRows(rows, selection, direction) {
     const indices = [...selection].sort((a, b) => a - b);
     if (!indices.length) throw Error("이동할 내역 행을 선택하세요.");
@@ -384,6 +405,7 @@ const EstBusiness = (() => {
     annual,
     newAnnualName,
     rowKey,
+    progressExclusions,
     moveEstimateRows,
     importContract,
     importBid,