Org data determination and copy control

Experts,

I have a scenario where service orders are created automatically form a service contract.  The same service order can also be created manually.

Org determination in service contract is based on the Sold-to-party.

Org determination in service order is based on the ship-to- party.

When service order are manually created - org data is determined based on ship-to-party  -

But when automatically created form Service contract the Org data is copied from Service contract.

Or  how can I redetermine the org data in the service order??????????

Thanks and Regards,

Ram