We have a vendor that we prepay with a credit card when ordering goods. When we receive the invoice (zero balance) from the vendor, how do I post it in the payables module as a prepaid invoice and still have the ability to record the correct expense GL accounts on the lines tab?

I understand how to post the invoice as prepaid using the Prepaid Invoice field. But when I do this I'm unable to record any expenses. When posting a payables invoice that is not prepaid, we normally breakup the expenses into various GL accounts such as supplies, freight and taxes. Since the prepaid invoice balance is zero, any entries makes the invoice 'out-of-balance' and therfore can not be posted.