Business process &1 cannot be planned with business transaction &2

What causes this issue?

You cannot plan activity &v2& on business process &v1&.
The activity RKP2 can only be planned with business processes of
category 1 and 4.
The activity RKPL can only be planned with business processes of
category 2 and 3.

System Response

The posting is not made.

How to fix this error?

Change either the activity when you call the planning data interface or
change the category of the business process.

Error message extract from SAP system. Copyright SAP SE.