AME Approval through Position Hierarchy

Hi All

Version : 11.5.10.2

Trying to Create Approval Hierarchy through AME Rules for Quoting Module.  Based on the discount percentage entered, Approvals should take place. Approval logic is

If discount >10 and < 25 % then

   Emp1 has to approve.

if discount > 25 and < 50 then

   Emp1 has to approve

   Emp2 has to approve.

I tried getting this logic done through position Hierarchy, i.e.

   Created two new Position P1 and P2. Attached the position P1 to Emp1, P2 to Emp2, P3 to Emp3

   Created Position :: Hierarchy Pos_Hierar-1

            Level 1 -->Attached P1 ( Emp1 ) [ has two subordinates, P2 & P3 ]

            Level 2 -->Attached P2 ( Emp2 ) [ has one subordinates P3 ]