No authorization for plant &

What causes this issue?

You do not have the necessary authorization for this activity in this
plant.

System Response

The system checks your authorization for the object 'M_LFPL_ORG'
(Organization levels of long-term planning).

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.

Error message extract from SAP system. Copyright SAP SE.