Storing Payment Cards in the Customer Master

At this time, if we try to store a payment cardt in a customer master, and card is is already stored in another, we get an error and the message, "Payment card &1 &2 is already assigned to customer &3." I am trying to find a way to not get this error, as we recently went live with CRM for our Customer Service group, and they create a new customer master for each location, and they all share the same credit card number. Is there a way around this?