Can't use Order Management Extension to query Custom Object PVO's - a new workaround is needed

Hi,

As part of our customize solution, we intended to use an OM Extension code to query Custom Object PVO's as introduced by Support 4 Months ago in a service request. based on the PVO's we applied some logic to modified sales order line 'On Save'

few days ago, we informed by a Proactive SR that accessing Custom Object PVO's from OM Extension will be deprecated at some point in the near future (24C if i'm not wrong)

1. We cannot use SOAP for querying the Custom object since it is a matrix and through SOAP we cannot filter or adding conditions to retrieve the relevant value from the custom object matrix