OM Extension to default Item Cost on Sales Order line

Summary:

We have a requirement to default Item Cost on Sales Order line EFF, we are trying through OM Extensions. our Org structure is as below:

One Cost Org consists is created per one BU

One Cost Book for all BUs (7 BUs)

One Cost Org has multiple Inventory Orgs assigned to it

Valuation Structure is Cost Org-Inventory Org

In order to fetch the cost of appropriate Inventory Org (provided under Sales Order), we are unable to find appropriate Valuation Unit as there are multiple Orgs assigned to Cost Org

Please find below code and help us to get Item Cost