R12 GL Account at the Payables Document level

Hello.

In 11i we were able to maintain GL accounts at the Payables Document Level, below the Bank Account.

In R12 I only see where to attach the GL Accounts at the Bank Account level.  We have 2 Payables Documents attached to a Bank Account, and want each Payables Document to have their own Asset Account.  Is that possible?  I cannot see where I can do this.

Thanks for your response.

Ann