Have you tried this procedure ?
http://help.sap.com/saphelp_nw73/helpdata/en/c1/7fa04378484344a3af7b8d355cf52c/content.htm
Creating a Check Group Manually
Use this procedure if you want to create a new check group manually, or if you want to add a new MTE class and its properties to an existing check group.
Best Regards
Marius