SAP Message WS023 - Billing doc. type & is not of category '&' or '&'

System Response
The system does not permit further processing of the document.

Procedure
You have the following options:

  • Assign vendor billing category &V2& or &V3& to the vendor billing
    • document type &V1&.
    • Change the assignment of reversal document type &V1& to vendor billing
      • document type &V4& in Customizing.