Offsetting Dr/Cr but with 2 different vendors

I have gotten myself in a mess - again.  Hope someone can help.

First I have to explain that each month when employees use their credit cards, we have them turn in an expense report for the charges but we use the name of the credit card company as the vendor rather than the employee - that way we pay direct to the card company. 

I had a small balance due on an Expense Report for an employee's credit card and was making a payment larger than that balance.  So, I used the difference to partially pay another ER for that employee.  When they both showed up separately in the check print que, I realized that the Expense Reports had crossed the time period where the credit card company changed names.  So one invoice is in the old name and the second in the new name.  Problem is I already selected them for payment and they were in the que for printing.  I didn't want