API to update ship to Org, Warehouse and sub-inventory on a Purchase Order

Hi all,

    We have come across a requirement to update the Ship-to Organization and Ship-to location on PO shipments and the Sub-inventory column on PO Distributions. These values have to be updated without the usage of the standard screens. This update has to happen on approved POs.

    As an added requirement, is there any work-around to avoid the PO from being sent for re-approval when the above updates are carried out on an approved PO?

    If anyone has come across a similiar situation, kindly help me out.

Thanks and regards

Aravindan V.