After changing PM planning plant, please check dependent objects

What causes this issue?

You are trying to change the <GL:maintenance_planning_plant>planning
plant</>.
The planning plant is used in all PM master data objects.

System Response

The following could occur, depending on how you have structured your
technical objects:
Data transfer could lead to the change in the planning plant being
passed on from a <GL:reference_functional_location>reference
location</>, for example, through a hierarchy of
<GL:functional_location>functional locations</> to pieces of
<GL:equipment>equipment</>. One possible result could be that the
pieces of equipment lose their associated <GL:bill_of_material>bills of
material</> if they are not defined in the new planning plant.

How to fix this error?

Check all the dependent objects.
Dependent objects are generally:

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

reference functional locations
functional locations
equipment
BOMs
materials
<GL:production_resource/tool>production resources/tools</>
<GL:work_center>maintenance work centers</>
<GL:maintenance_task_list>task lists</>
<GL:preventive_maintenance_plan>maintenance plans</>
<GL:maintenance_order>maintenance orders</>

Error message extract from SAP system. Copyright SAP SE.