diff --git a/WebAPI/dataProcessors/t3.MultiSourceYearSummary.processor.cs b/WebAPI/dataProcessors/t3.MultiSourceYearSummary.processor.cs
index 927cfa2..cb59b4a 100644
--- a/WebAPI/dataProcessors/t3.MultiSourceYearSummary.processor.cs
+++ b/WebAPI/dataProcessors/t3.MultiSourceYearSummary.processor.cs
@@ -62,7 +62,6 @@ namespace WebAPI.dataProcessors
             List<Record> newRecords = new List<Record>();
 
             List<Layer> dataSources = new List<Layer>();
-
             foreach (Record source in sources!)
             {
                 Layer? dataSource = db.Layers.Where(x =>
@@ -77,19 +76,44 @@ namespace WebAPI.dataProcessors
                     dataSources.Add(dataSource);
                 }
             }
-
             if (dataSources.Count == 0)
             {
                 throw new Exception($"DataSources are empty");
             }
 
-            List<Record> allRecords = dataSources.SelectMany(x => x.Records!).ToList();
+            List<Layer> dataSourcesValidation = new List<Layer>();
+            for (int i = 1; i < 13; i++)
+            {
+                Layer? dataSource = db.Layers.Where(x =>
+                    x.Type == LayerType.processed
+                    && !x.IsDeleted
+                    && x.Name.Contains($"{year}/{i}-AA-T3"))
+                    .Include(x => x.Records)
+                    .FirstOrDefault();
+                if (dataSource != null)
+                {
+                    dataSourcesValidation.Add(dataSource!);
+                }
+            }
+            if (dataSources.Count == 0)
+            {
+                throw new Exception($"DataSourcesValidation are empty");
+            }
+
+
+            List<Record> allRecords = dataSources
+                .SelectMany(x => x.Records!).ToList();
+            List<Record> allRecordsValidation = dataSources
+                .SelectMany(x => x.Records!).ToList();
             foreach (Record baseRecord in dataSources.Last()?.Records!)
             {
 
                 List<Record> codeRecords = allRecords.Where(x =>
                     x.Code!.Substring(1) == baseRecord.Code!.Substring(1))
                     .ToList();
+                List<Record> codeRecordsValidation = allRecords.Where(x =>
+                    x.Code!.Substring(1) == baseRecord.Code!.Substring(1))
+                    .ToList();
                 Record processedRecord = new Record
                 {
                     Id = Guid.NewGuid(),
@@ -97,10 +121,23 @@ namespace WebAPI.dataProcessors
                     CreatedAt = DateTime.UtcNow,
                     ModifiedAt = DateTime.UtcNow
                 };
+                Record validationRecord = new Record();
                 for (var i = 1; i < 33; i++)
                 {
                     ProcessHelper.setValue(processedRecord, i,
                         codeRecords.Sum(x => ProcessHelper.getValue(x, i)));
+
+                    ProcessHelper.setValue(validationRecord, i,
+                        codeRecordsValidation.Sum(x => ProcessHelper.getValue(x, i)));
+
+                    if (
+                        ProcessHelper.getValue(processedRecord,i) !=
+                            ProcessHelper.getValue(validationRecord, i))
+                    {
+                        throw new Exception($"ValidationError: Code {baseRecord.Code!}, " +
+                            $"Value{i} ({ProcessHelper.getValue(processedRecord, i)} | " +
+                            $"{ProcessHelper.getValue(validationRecord, i)})");
+                    }
                 }
                 newRecords.Add(processedRecord);
             }