P_PERNR problem

Hi,

I have some problem in object P_PERNR. Hope someone can help me with the following scenario.

One of my client needs ESS/MSS. My problem is that in the portal, there is an option for employee to be delegated the position of manager when his/her manager is not around. We need to restrict that the employee will not be able to approve his/her own request when he/she is in the position of manager.

To make it clear, here is the detailed description. Employee A would like to request for Leave (IT2001). Once the request is made, the request will be sent to employee A's manager for approval. If the manager is not around, Employee A can be delegated the task of manager. However, we would like to restrict that Employee A would not be able to approve the leave application which he/she make earlier.

I understand that this can be done through object P_PERNR. However, I have tried a lot of combination but I still end up with the same. Can anyone help?

Sean