On occasion there could be payments which fail to post in Opera. This can happen even though the payers card was charged. This error most commonly occurs when the reservation is left open at the property when the payment is attempted.
If you do not have these already, you can have them created in your system. These are set up to work like the "cash" payment code in that you can tell OPERA you have obtained the money elsewhere and the entered amount into OPERA is to balance the folio.
If they are not already existing in your PMS, please take the following steps:
Opera configuration < cashiering < payment types < add new < manual VISA.
(repeat for other credit card types).
If you do not have access to these screens in Opera, you will need to reach out to Opera Support to have them created.