When selecting a Work Order to associate with the Project, does the WO have to be accepted, or can they be in draft, or sent, or proposed states?

When selecting a Work Order to associate with the Project, the WO can be in any status -- draft, sent, proposed, approved -- as long as the Vendors has been invited.

A draft Work Order for a Vendor who has not yet been invited, that WO is not available for adding to a Project.