AP check clearing

Dear experts,

When I tried to clear a check it's offsetting against the same sub account though I have two different GLs setup in bank config

in FBZP under bank determination <> Bank account <> my sub account / clearing account is 123456

and in house banks, bank's GL is 321456

The invoice and payment postings are correct. But, when I'm clearing the check it's posting dr and cr to same GL account 123456

Can someone please advise if I'm missing something?

Regards,

Sri