MultiProvider '&2': Cannot change key figure '&1'

What causes this issue?

Key figure '&V1&' in MultiProvider '&V2&' cannot be changed for data
records from PartProvider '&V3&' because this InfoProvider does not
contain the key figure.

System Response

In this case, the key figure value cannot be changed by a planning
function.
In manual planning the cells that are relevant to this data record are
input ready. The system does not transfer the key figure value to newly
entered rows.

How to fix this error?

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

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.