Aggregate contains all characteristics of master planning obj. struct. &1

What causes this issue?

You have added all characteristics of the master planning object
structure to the aggregate. This is not allowed. An aggregate may not
contain all the characteristics of the master planning object
structure.

System Response

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

How to fix this error?

Please remove at least one characteristic from the list of
characteristics for the aggregate and repeat your action.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.