Payment medium format &1 is missing the module for event &2

What causes this issue?

Payment medium format &V1& has been defined incorrectly.

System Response

Processing termination

How to fix this error?

IF &V1(1)& EQ '/'
The format is not part of the standard delivery of the SAP system.
Contact the author of the format.
ELSE
Contact your system administrator or create an OSS message.
ENDIF


&TECHNICAL-INFO&
No function module was defined at event &V2& for payment medium format
definition &V1&.
<DS:TRAN.FQP3>Proceed</>

Error message extract from SAP system. Copyright SAP SE.