Partner function tab in sales area data of BP

Hi ,

I have a requirement of updating the partner function tab ( SH,BP,PY etc) & billing tab under sales & distribution area in BP depending on few conditions.

I tried finding some BADI's like partner_update ,BUPA_FRG0060_UPDATE, BUPA_GENERAL_UPDATE. But i am not sure as to which one will be the appropriate one. Is there any other BADI available or another way to achieve this ?

Any help would be appreciated.

Thanks,

Namrata