Reading sold to party of the contract

Hi Experts,

I have a view at header level of the contract with four attributes and i have an insert button on the view. Whenever i press on insert, one of the attribute (Partner) has to populated with the value i.e, sold to party of the contract.

I already have BTAdminH as one of the context node in my view.

Could you please suggest me, how can i read the sold to party of the contract in the event 'EH_ONINSERT' and make that value as default for the attribute (Partner) in the view, when insert is clicked.

Thanks,

BKVS.