Category marketing plan is excluded from ERP integration

What causes this issue?

The object class is excluded from ERP integration in Customizing.
Therefore, ERP integration cannot be activated for object &V1&.

System Response

The object cannot be saved.

How to fix this error?

Set the indicator 'No ERP integration' for object &V1&.

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.