& is not a payment method on the debit side

What causes this issue?

The payment method entered does not result in a bill being sent to a
credit card company.

System Response

A bill will only be drawn up for the customer who purchased the
goods.

How to fix this error?

If you do not wish any bill to be sent to a credit card company, no
further action is required on your part.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

If you wish a bill to be sent to a credit card company using this
payment method, assign the relevant customer (credit card company) to
the payment method.

Error message extract from SAP system. Copyright SAP SE.