Credit Card Distribution Account

I am trying to setup Travel Card (Credit card) in R12. While defining the card program the system requires me to enter 'Expense Clearing Account' which is a mandatory field. After I have uploaded the transactions and created the invoice to be paid to the supplier and when I check the line I get the same account under the "Distribution Account' field that I had defined in the expense clearing account  in the card program.

I want the distribution account to be constructed by the account generated taking the department from the employees HR record and the account as defined in the code set. How can I do this?