I have implemented pt_abs_req and is using this and in the first approver step of WF91000032 I have created my own rule with a FM.
This function module is retrieving the manager of the Leave Req owner AND the assistant of the Manager(we do not use substitution) so the approve notification should go to multiple approvers in one level.
As you can see in the third picture in the last post there are only one approver in the recipient list even thou I have two agents returned by my FM as seen in screenshot two.