diff --git a/app/api/import_data.py b/app/api/import_data.py
index 1c076b4..3bf7bf9 100644
--- a/app/api/import_data.py
+++ b/app/api/import_data.py
@@ -1743,6 +1743,8 @@ async def validate_csv_file(
         mapping_info = _build_dynamic_mapping(csv_headers, model_class, file_type)
         mapped_headers = mapping_info["mapped_headers"]
         unmapped_headers = mapping_info["unmapped_headers"]
+        # Accept legacy wide-format SETUP.csv as valid (Appl_Title, L_Head1..10, Default_Printer)
+        wide_ok = (file_type == "SETUP.csv" and _is_setup_wide_format(csv_headers))
         
         # Sample data validation
         sample_rows = []
@@ -1770,7 +1772,7 @@ async def validate_csv_file(
         return {
             "file_type": file_type,
             # Consider valid if we can map at least one column; we don't require exact header match
-            "valid": len(mapped_headers) > 0 and len(errors) == 0,
+            "valid": (len(mapped_headers) > 0 or wide_ok) and len(errors) == 0,
             "headers": {
                 "found": csv_headers,
                 "mapped": mapped_headers,
@@ -1781,6 +1783,7 @@ async def validate_csv_file(
             "total_errors": len(errors),
             "auto_mapping": {
                 "suggestions": mapping_info["suggestions"],
+                "wide_format": wide_ok,
             },
         }