Tax procedure in J_1IT030K_V,,,,,

Hi Experts,

I am defining the Combination of Tax code, business place and GL combination in SM30..Table J_1IT030K_V...

The problem is system is picking the GL account from OB40 , insted of This table...i have configured all the Business place, assignment, tax code all thing..

Why system is picking from OB40 insted of This table....any activation is required ...please guide..

Another importent this is in this table while maintaing the combination..in Tax code column if i press F4 i am not geting the my Tax procedure and tax code....i am getting different tax procedures and tax codes....how can i get my tax code and tax procedure in this field?

Please give me some inputs...

Thanks

Chandu