We had a requirement where in we need to hide the Re-Assign button in the PO Requisition Approval Notifications. We have added a new attribute #HIDE_REASSIGN in the workflow approval notification and set the attribute type as look-up and it default value to 'Y'. When we did this, vacation rules were not working as #HIDE_REASSIGN property will over-write the vacation rules for the users. Users will not be able to Delegate or Transfer the Notification. To handle this, we have changed the Attribute type to Text and the Constant value as 'B'. This solved the issue.