Unmapped object in deprovision step

We have a lot of connected systems in our ARSS.  All our workflows contain, provision, update and deprovision steps.

In our deprovision steps, we just disable the target object if source object is out of synchronization scope (remove from one specific group).

Unfortunately, the source and the target objects are still mapped and that cause us trouble with other workflow.

Is it possible to unmap objects in the step handlers of the deprovision steps?