Maintenance item not allocated to a technical object

What causes this issue?

You are trying to select a <GL:standard_task_list>standard task list</>
for the <GL:maintenance_item>maintenance item</>. This is
not possible for this maintenance item as it has not been allocated a
technical object.

System Response

INCLUDE 'KEINE-FUNKTION' OBJECT DOKU ID TX LANGUAGE E

How to fix this error?

If you want to select an
<GL:equipment_task_list>equipment task list</> or
<GL:functional_location_task_list>functional location task list</>,
you must first allocate the appropriate technical object to the
maintenance item before calling up the function again.
If you do not want the maintenance item to refer to a technical object,
the only task lists that you can select are
<GL:general_maintenance_task_list>general task lists</>, for which
there is a separate function available.

Error message extract from SAP system. Copyright SAP SE.