Blanket Purchase Agreement approval by the same approver who approved the initial requisition ?

Hello,

we have the requirement as below.

Please advice how this can be achieved by using minimal customization.

1) Requestor creates a requisition

2) Requisition is sent for approver based on the amount limit and cost centre to the budget owner. ( We are using position heirarchy now. Approval groups and approval assignment will route to correct approval based on the amount limit and cost centre )

3) Approved requisitions show up in the Auto Create Queue

4) Buyer copies the Requisition into RFQ

5) This RFQ copied into Quotation

6) Quotation is in turn copied into a Blanket Purchase Agreement.

7) Now this BPA need to be sent to the same approver who has approved the requisition initially. ( This BPA now will have the supplier information, the requisition did not, we want control in place such that correct supplier is chosen for awarding the contract )