Payment defaults to the incorrect GL accounts payable account

At the vendor and vendor class I have the accounst payable account set as 21110-00-20.  However, when I process the check run batch, the payment debits account 21110-00-00 for the payables transactions, instead of 21110-00-20 where teh invoices was originally posted.  Is there an accounts payable GL code  default setting in GP 10 for the payment batch of which I am not aware?

Any help is appreciated.

Thank you,

Roy Ozols