Revenue recognization in Bill of service case with WBS element

Dear All,

I am doing the Bill of services scenario.

i am creating a sales order and maintaining the Bill of services and maintain WBS element in service line item.

2nd step creating a debit memo request  where maintain the BOS (Services performed) for the month.

3rd step i am doing the(debit memo).

After creating the sales order , we are doing the Revenue reorganization (WBS Element level) where we are getting planned revenue as Sales order revenue.(This is ok)

After creating the Debit memo request once aging we are doing Revenue reorganization where we are getting planned revenue as (Sales order revenue Plus Debit memo request amount).(Wrong as updating planned revenue once again as debit memo request amount)

After After creating the Debit memo (Invoice)once aging we are doing Revenue reorganization where we are getting planned revenue as (Sales order revenue Plus Debit memo request amount) and updating the Actual revenue as Debit Memo amount.

Can anyone please help how to control on the duplication of planned revenue after Debit memo request done.

Thanks & Regards

Sujit Mahanty