Copy Price PR00 from Contract to Debit Memo Request - RRB

Hi All

We have below requirement:

1. Service contract is created for DIEN and FERT materials. there are around 1000- 2000 items in contracts.
2. Client want to maintain PR00 manually. They don’t want to maintain condition record. so they will enter price in manual while created contract.
3. for reference Contract would have WBS element in Header. same will be maintained in Service order & DMR.This would be link to contract and DMR.

4.     Resource related billing program (DP97/DP90) would create Debit memo request from service order

5.     We want DMR (Debit Memo Request) to pick PR00 price from Service contracts for line items.after DP90.

Solutions we are working on : We are trying to create a condition type routing to pick price from contract line item and put them in DMR line items. WBS element is the Key. ABAP is working on to custom routine to achieve this.

Do we have alternates or better solution to achieve this?

P.S.  - Our Business flow:

1.     Contract

2. Notification --> Service order --> DP90 --> Debit memo --> invoice.