Net Price is "0" when importing sales order with Freeze Price = N

Summary:

Hi,

We have implemented an OM extension at "On Save" event to validate the Net Price / Unit selling price with a value passed in Line EFF. It is working fine if the sales order is created manually in UI but not working if an order is imported using REST API with Freeze Price as "N".

The issue we observed is that, the Net Price is populated as "0", while the extension is getting executed.

Can someone please suggest, if this can be achieved and what changed need to be done on the below code?

Existing code in OM Extension-

import oracle.apps.scm.doo.common.extensions.ValidationException;