I'm trying to figure out what I've done wrong or maybe just haven't done at all so that I can create a purchase order for three items under a project task. This is a small project and my first that I've actually taken the time to setup in BC.
Under line 1201 there are three line items starting with A05B.... They are non-inventory, have a vendor assigned to them, etc.


Whether I select those three lines or attempt to select the entire task in the project card > actions > create purchase orders I receive this message and nothing happens.

What am I missing or doing wrong?