Diagnosis
You want to maintain plan values for a variant of an appropriationrequest. However, there is no plan profile entered in apppropriationrequest type &V1&.

System Response
It is not possible to maintain plan values without a plan profile.

Procedure
Maintain appropriation request type &V1& in Customizing.
Enter a plan profile for overall planning.
After you maintain the appropriation request type, you can enter planvalues.