1. In Accounts Payable, select Set Up, Basic Set up
  2. Enter C to Change
  3. Enter option 3: Ledger options
  4. In the AP acct mask line, enter the appropriate account.
    NOTE: This can be a full account, or include masking.  For example, if you use the account mask on the fund of AXX-2000 and enter an expense debit to A02-5000, the Accounts Payable summary will automatically fill the masked dimension to match.  The account would be A02-2000.