Task list used in maintenance item &, no changes possible

What causes this issue?

You want to cancel the release of the task list for order processing
using the task list status. However, the task list is still being used
in a <DS:GLOS.3528F484E8E6556EE10000009B38F983>maintenance plan</>.

System Response

You can only cancel the release of the task list for order processing
if you have previously canceled the use of the task list in the
maintenance plan.

How to fix this error?

Delete the use of the task list in the maintenance plan.

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.