Voucher Accounting lines and Credit distribution accounts

We have users that are entering vouchers with a distribution line to a revenue account and one to a expense account.  We use cash clearing for our payments.  When the accounting entries are created, the expense account related cash payment line is using the chartfield inheritance rules setup on the External Bank.  However, the payment line associated with the revenue account is not.  It seems to be following some different logic.  Do credits behave differently for payments? 

thanks in advance!