Two credit card programs at same time

Hi,

Currently we use Visa credit cards where a feed is loaded into AP Credit Card Trxns table and then users use that to create expense report. Business wants to change to Amex cards but they want a transition period. So it may be possible that one user will have credit card transactions from both Visa and Amex available at same time to pick in expense reports.

I think loading into AP Credit Card Trxns table should not be an issue. What other issues can i face in expense report creation/approval/ap invoice creation and payment? I can ask them to have a process to use separate expense report for each type of transactions.