Need to Add Nav attributes for 9A* characteristics to be used in SNP

Hi friends

I am in SCM7.1 system ( fresh installation)

Can any one please help me to provide procedure to add navigational attributes to SAP standard Chars. 9AMATNR and 9ALOCNO, they have to be used for standard POS 9ASNPBAS to be used for SNP.

I am trying to add the template characteristics that i have created for both 9AMATNR and 9ALOCNO, but it disappears from the POS.

Is there a limitation in APO that standard characterisitcs cannot be added with attributes ? if it can be done is there any (Exit, BADI) that needs to be used.