Pur. Requistion hierarchy issue

All,

We are on 11.5.10 and are using Core Purchasing. Need your help on the below

We are creating a new hierarchy for Purchase Requisition approval like below

1. Requestor (with .01 approval limit)

2. SL Approver (with 50k approval limit)

3. Fin approver (with 100k approval limit)

I performed the below steps

1. Created the 3 positions as mentioned above

2. Assign the positions to 3 different employees

3. Created the position hierarchy as

     i. Fin approver

    ii. SL approver

   iii. Requestor

4. Created approval groups for each of the above

5. Assigned approval groups to the Positions in the approval assignments

6. Assigned the position hierarchy to the Purchase Requisition in the Document Types setup and made if default