This is not possible. You need to implement your own Login Module Authentication. See also:
http://help.sap.com/saphelp_nw70/helpdata/en/46/3ce9402f3f8031e10000000a1550b0/content.htm
This is not possible. You need to implement your own Login Module Authentication. See also:
http://help.sap.com/saphelp_nw70/helpdata/en/46/3ce9402f3f8031e10000000a1550b0/content.htm