Sold-To Party for Inqury

Hi,

I have just created a new Sales Order Type (Inquiry) in SPRO, but when I use the Transaction VA11 to create the new Inquiry Type, the Sold-To party and the Ship-To Party are disabled... (Blanked out to prevent from entering value). I have already created several Customer Master for the Sales Area. Can anyone please give some advice to solve this?

Thanks.