What is the best possible migration approach for unbilled GRNs

Summary:

Hello Oracle Experts! We are facing a challenge in migrating the unbilled GRNs. The value and the volume of the unbilled GRNs are huge in number and so the client is not agreeing to convert them into an Invoice in their old system and also not agreeing to complete those POs in the old system (EBS). Our business is following 3 way match for all the POs and hence an Invoice requires a GRN in the Fusion system.

Approach we finalized:

We planned to move the unbilled GRN (Inventory Items & Expense Items) as separate PO with expense lines (by adding the Item Description) and migrate them as OPEN PO and then load the GRN using FBDI for the respective POs and later that will be expensed against the migration account and thereby increases the GRIR balance and after that they can able to create the AP Invoice by matching the Expense PO whenever they get the Invoice from the supplier.