From 0f635cef0f229526b2c508e4b3b35edbd065db4f Mon Sep 17 00:00:00 2001
From: umsangdon <umsangdon@gmail.com>
Date: Sat, 7 Nov 2026 10:31:12 +0900
Subject: [PATCH] fix(est): distinguish repeated change items

---
 resources/tester/test_est_change_workflow.py | 16 ++++++++
 tools/est-test/native-business.js            | 43 +++++++++++---------
 2 files changed, 40 insertions(+), 19 deletions(-)

diff --git a/resources/tester/test_est_change_workflow.py b/resources/tester/test_est_change_workflow.py
index 55258169d..9afec9ac7 100644
--- a/resources/tester/test_est_change_workflow.py
+++ b/resources/tester/test_est_change_workflow.py
@@ -1,6 +1,22 @@
 from test_est_rea_parity import run
 
 
+def test_duplicate_codes_match_distinct_original_rows_and_track_deletions():
+    result = run(
+        "math",
+        """(()=>{
+      const p=EstNative.empty();p.tables.EstMainDat=[{Code:'A',Name:'first',GN:2,TC:200},
+        {Code:'A',Name:'second',GN:4,TC:400}];
+      p.baseline={name:'old',tables:{EstMainDat:[{Code:'A',Name:'first',GN:1,TC:100},
+        {Code:'A',Name:'second',GN:3,TC:300},{Code:'A',Name:'removed',GN:5,TC:500}]}};
+      return EstBusiness.changes(p);
+    })()""",
+    )
+    assert [row["originalTC"] for row in result] == [100, 300, 500]
+    assert [row["difference"] for row in result] == [100, 100, -500]
+    assert result[-1]["status"] == "deleted"
+
+
 def test_design_change_costs_include_duplicate_new_and_deleted_cost_rows():
     result = run(
         "math",
diff --git a/tools/est-test/native-business.js b/tools/est-test/native-business.js
index e64fd54b2..ee9e64078 100644
--- a/tools/est-test/native-business.js
+++ b/tools/est-test/native-business.js
@@ -54,10 +54,15 @@ const EstBusiness = (() => {
   }
   function changes(project) {
     const old = project.baseline?.tables.EstMainDat || [];
-    const seen = new Set();
+    const groups = new Map();
+    old.forEach((row, index) => {
+      const key = rowKey(row, index),
+        group = groups.get(key) || [];
+      group.push({ row, index });
+      groups.set(key, group);
+    });
     const changes = project.tables.EstMainDat.map((row, index) => {
-      seen.add(rowKey(row, index));
-      const saved = old.find((r, i) => rowKey(r, i) === rowKey(row, index));
+      const saved = groups.get(rowKey(row, index))?.shift()?.row;
       const stored =
         !project.baseline && ["Code_", "Name_", "GN_", "TC_"].some((key) => row[key] != null)
           ? Object.fromEntries(
@@ -87,22 +92,22 @@ const EstBusiness = (() => {
         originalSource: saved ? "baseline" : stored ? "file" : null,
       };
     });
-    old.forEach((row, index) => {
-      if (seen.has(rowKey(row, index))) return;
-      changes.push({
-        key: rowKey(row, index),
-        Code: row.Code || "",
-        Name: row.Name || "",
-        originalGN: num(row.GN),
-        originalTC: num(row.TC),
-        GN: 0,
-        TC: 0,
-        difference: -num(row.TC),
-        NewItem: false,
-        status: "deleted",
-        originalSource: "baseline",
-      });
-    });
+    for (const group of groups.values())
+      for (const { row, index } of group) {
+        changes.push({
+          key: rowKey(row, index),
+          Code: row.Code || "",
+          Name: row.Name || "",
+          originalGN: num(row.GN),
+          originalTC: num(row.TC),
+          GN: 0,
+          TC: 0,
+          difference: -num(row.TC),
+          NewItem: false,
+          status: "deleted",
+          originalSource: "baseline",
+        });
+      }
     return changes;
   }
   function costChanges(project) {