Enter a payment key &1 (country: &2)

What causes this issue?

Payment key &v1& does not exist in the Customizing of SAP Collections
and Disbursements (FS-CD).

System Response

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

How to fix this error?

Perform one of the following activities:
Enter a different payment key.
In Customizing of FS-CD, create payment key &v1& for the payment method
used (see below "Procedure for System Administration").

Procedure for System Administrators

INCLUDE ICL_MESSAGE_CUST OBJECT DOKU ID TX

Error message extract from SAP system. Copyright SAP SE.