Condition type & is not defined for rebate agreements

What causes this issue?

Condition type &V1& is a condition type for normal pricing elements,
but it is not allowed for <GL:rebate_agreement>rebate agreements</>.

System Response

The system does not allow your entry.

How to fix this error?

Enter a condition type defined for rebate agreements. You can search
for such a condition type by using <PF>F4=Possible entries</>.

Error message extract from SAP system. Copyright SAP SE.