Aggr. level &1: Composite Provider &2 is not a valid basis (&3) &4

What causes this issue?

You are trying to create aggregation level &V1& on CompositeProvider
&V2&. You <ZH>cannot </>define an aggregation level on this
CompositeProvider.,,
The keyword for the reason is: &V3&.
The following scenarios are currently not supported:
- CompositeProviders with joins where an inputable PartProvider is
involved
- CompositeProviders involving characteristic mapping with different
basis characteristic names
- CompositeProviders with a navigational attribute, which is not mapped
from all inputable partial providers.
- CompositeProviders with a constant target.

System Response

Aggregation level &V1& is <ZH>not </>created in such cases. See SAP Note
2091885 for current restrictions on CompositeProviders that are modeled
for planning usage.

How to fix this error?

Select a different InfoProvider to define aggregation level &V1& on or
remodel your current CompositeProvider.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.