Hi,
We have a patron who is insisting that we remove his credit card number from our records, which we are more than happy to oblige. We found, however, that we can only mark them invalid, we have not been able to permamently delete them as we get a message that the number is being referenced in other tables.
Surely there has to be some way to delete them from the constituent account?
Is there any chance the card is being used for a scheduled payment by your development department? That is the only place I know that "stores" the card number besides the transaction tab. My next guess would be a security element on the system table, but I don't have any experience in that area.