Hi There,
We are on HR Renewal 1.0 FP4 and using MSS Substitution for workflows.
We have a situation(well i am sure this is more than common), If manager selects a team member as his/her substitute. This team member will starts to receive and approve all the Leave/timesheet/HCM processes and other approval requests on behalf of Manager.
These requests will also include Substitute's own requests. We are using approval standard tasks(just to make things little more interesting) 
Now we want to avoid any self approval situations. There is similar functionality delivered for Leave encasement. Now we were looking for something similar for Leave/timesheet services or if something can be managed at very high level to restrict all self approval across system.
If you would faced this issues and have any thoughts around how we can approach.
Regards,
Sudhir