Hi Shaik,
After entering the Sold-To party the partner determination will be started based on your partner determination procedure. If it is determining more than one Ship-To (For Eg) then it will give a popup.
If you are thinking the Ship-To need to be selected based on the Sold-To alone then you need to change your partner determination access sequence of Ship-To for the complaint.
Kindly let me know whether my understanding about your query is correct.
Thanks,
Ravi