diff --git a/Marco.Pms.Services/Service/MasterService.cs b/Marco.Pms.Services/Service/MasterService.cs
index b60f399..9de13fc 100644
--- a/Marco.Pms.Services/Service/MasterService.cs
+++ b/Marco.Pms.Services/Service/MasterService.cs
@@ -1371,7 +1371,11 @@ namespace Marco.Pms.Services.Service
                     _logger.LogWarning("Employee {EmployeeId} tries to {Action} Document Type, but not found in database", loggedInEmployee.Id, action);
                     return ApiResponse<object>.ErrorResponse("Document Type not found", "Document Type not found", 404);
                 }
-
+                if (documentType.IsSystem)
+                {
+                    _logger.LogWarning("Employee {EmployeeId} tries to {Action} Document Type, but could not take action on system defined entity", loggedInEmployee.Id, action);
+                    return ApiResponse<object>.ErrorResponse($"Document is system defined cannot be {action}d", $"Document is system defined cannot be {action}d", 400);
+                }
                 // Mapping DocumentTypeMatser to BsonDocument
                 var existingEntityBson = _updateLogHelper.EntityToBsonDocument(documentType);