Unable to find print request type &

What causes this issue?

In <GL:Customizing>Customizing</> Table TVFK, the system was unable to
find the print request type (billing document type) you entered.

How to fix this error?

Check if the print request type you entered is correct.
Maintain the print request type in Customizing Table TVFK, if
necessary.

Error message extract from SAP system. Copyright SAP SE.