E90 will do exactly as you indicated: The invoice amount + the Current balance (not including any overdue amounts). If you want the total AR outstanding balance added to the invoice total, use the E66 code, found in the same place you chose E90. This field is entitled 'Net invoice total (less retainage) + Outstanding balance from the AR customer file'. This should include the total AR amount for the customer, not just the current balance.

Your original posting asked for the current balance added to the invoice amount. Note the current balance is just that, the amount that is not overdue. If you really meant the total balance including 30/60/90 overdue, then pick the E66 code that uses the entire outstanding amount for your spec.

Regards,
Softrak Support