BAPI_SALESORDER_CHANGE to change a partner

Hi,

I want to make use of BAPI_SALESORDER_CHANGE to change the customer number for one of the partner functions on the order. What do I need to pass to the PARTNERS, PARTNERCHANGES, PARTNERADDRESSES. Please advise on how these data can be populated to change just one of the customers on the partner data of a Sales order.

Point will be awarded

regards,

Satya