There is a problem with the original question; more clarifications from the poster is needed.
It boils down to the accounting principle of double entry. One payment (Cr entry in bank) cannot be used for two debit entries of the same amount (Dr Accounts Payable to pay the bill, and Dr Loan a/c to decrease the loan).
What we know from the original poster is that the bill was for "taxes and licenses", presumably a category in the P&L expenses, but was it meant for the business expense or was it paid on behalf on the loan provider ?
If the bill was meant for the loan provider, the answer is to remove the bill, and post the payment directly to the loan account. If not, more questions arise...
