diff --git a/Models/Recruits/RecruitScore.cs b/Models/Recruits/RecruitScore.cs
index 9698b3f..283bfd9 100644
--- a/Models/Recruits/RecruitScore.cs
+++ b/Models/Recruits/RecruitScore.cs
@@ -83,6 +83,8 @@ namespace BMA.EHR.Recruit.Models.Recruits
         [MaxLength(50), Comment("สถานะคัดกรองคุณสมบัติ")]
         public string ExamAttribute { get; set; } = string.Empty;
 
+        public Guid ScoreImportId { get; set; }
+
         public ScoreImport ScoreImport { get; set; }
 	}
 }
diff --git a/Models/Recruits/ScoreImport.cs b/Models/Recruits/ScoreImport.cs
index badee62..413f3f2 100644
--- a/Models/Recruits/ScoreImport.cs
+++ b/Models/Recruits/ScoreImport.cs
@@ -7,7 +7,9 @@ namespace BMA.EHR.Recruit.Models.Recruits
 	{
 		public int Year { get; set; }
 
-		public Document ImportFile { get; set; } = new Document();
+		public Guid? ImportFileId { get; set; }
+
+		public Document ImportFile { get; set; }
 
 		public virtual List<RecruitScore> Scores { get; set; } = new List<RecruitScore>();
 
diff --git a/Services/ImportBackgroundService.cs b/Services/ImportBackgroundService.cs
index 6841bc5..64b1af8 100644
--- a/Services/ImportBackgroundService.cs
+++ b/Services/ImportBackgroundService.cs
@@ -615,9 +615,9 @@ public class ImportBackgroundService : BackgroundService
         imported.LastUpdateFullName = job.FullName ?? "System Administrator";
         imported.Scores = new List<RecruitScore>();
 
-        // Save ScoreImport — use shadow FK for ImportFile to avoid re-inserting Document
-        var scoreEntry = _context.ScoreImports.Add(imported);
-        scoreEntry.Property("ImportFileId").CurrentValue = doc.Id;
+        // Save ScoreImport — set ImportFileId FK directly (explicit property, not shadow)
+        imported.ImportFileId = doc.Id;
+        _context.ScoreImports.Add(imported);
         await _context.SaveChangesAsync();
         _context.ChangeTracker.Clear();
 
@@ -713,7 +713,7 @@ public class ImportBackgroundService : BackgroundService
                     // Set ScoreImportId FK for all scores in batch
                     foreach (var score in batchScores)
                     {
-                        _context.Entry(score).Property("ScoreImportId").CurrentValue = scoreImport_id;
+                        score.ScoreImportId = scoreImport_id;
                     }
                     await _context.BulkInsertAsync(batchScores);
                     batchScores.Clear();
@@ -727,7 +727,7 @@ public class ImportBackgroundService : BackgroundService
             {
                 foreach (var score in batchScores)
                 {
-                    _context.Entry(score).Property("ScoreImportId").CurrentValue = scoreImport_id;
+                    score.ScoreImportId = scoreImport_id;
                 }
                 await _context.BulkInsertAsync(batchScores);
             }