Set Document Owner as Ad hoc Agent ?

Hi there,

I have a problem with the process controlled workflow within SRM 7.

The Situation is:

When a purchaser creates a shopping cart it triggers the automatic approvel workflow. Means the shopping cart autimaticaly is approved by the system after ordering.

In some cases the puchaser will add an Ad hoc Agent to approve his shopping cart. When this happens the purchaser have to add himself as last approver because the last approver has to be a purchaser.

The Problem is, the purchaser can't add himself as Ad hoc Agent because the system does not allow when he is the document owner/creator.

Is there any solution in customizing or badi where I can make it happen that the purchaser can add himself as ad hoc agent when he is the document owner?

In SRM 4 I now it is possible to add myself as ad hoc agent when I am the document owner.