Maintenance plan not adapted by resetting of technical completion

What causes this issue?

You have canceled the <DS:GLOS.technical_completion>technical
completion</> for the <DS:GLOS.maintenance_order>order</>.

System Response

This cancellation no longer has any effect on the scheduling of
maintenance planning. This means that the confirmation date in the
<DS:GLOS.maintenance_plan>maintenance plan</> contains the value
(technical completion date) of the preceeding completion.
The reason for this is that in certain circumstances, the maintenance
plan has already been scheduled with this value and therefore the
confirmation date can no longer be removed from the maintenance plan.

How to fix this error?

In the maintenance plan for this order, control whether the deadlines
calculated are still correct. If the deadlines are no longer correct,
fix the planned date to the date you desire or restart the maintenance
plan.

Error message extract from SAP system. Copyright SAP SE.