=== modified file 'modules/db.mssql/db_mssql_migration_grt.py'
--- modules/db.mssql/db_mssql_migration_grt.py	2013-08-27 22:37:54 +0000
+++ modules/db.mssql/db_mssql_migration_grt.py	2014-02-12 18:33:56 +0000
@@ -1,4 +1,4 @@
-# Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved.
 #
 # This program is free software; you can redistribute it and/or
 # modify it under the terms of the GNU General Public License as
@@ -216,7 +216,10 @@
             target_datatype = ''
             if source_datatype in ['VARCHAR', 'NVARCHAR']:
                 if source_datatype == 'VARCHAR':
-                    type_cast_expression = "CAST(? as NVARCHAR(%d))" % target_column.length
+                    if target_column.length > 4000 or target_column.length == -1:
+                        type_cast_expression = "CAST(? as NVARCHAR(MAX))"
+                    else:
+                        type_cast_expression = "CAST(? as NVARCHAR(%d))" % target_column.length
                 if source_column.length == -1:  # VARCHAR(MAX) or NVARCHAR(MAX)
                     target_datatype = 'LONGTEXT'  #TODO: Give the user the choice for this target datatype
                 elif 0 < source_column.length < 256: