Purchase Req for third party items on SO-where are required fields defined?

I have that issue where when a third party item is entered on a sales order, it goes on credit hold and when you release it, it tries to create a purch req but can't because of the required field - Val Price is not automatically filled in. I thought I could make the field not required by going to config and under purch

requistion>Define Screen layout at Doc level and changed the price and

unit option to optional instead of required but it still treats it like

a required entry. That config change only affected that field if creating a purch req from scratch, didn't affect if creating one from sales order third party item.

Thanks for any input!