How does Purchase Direct flag get set on a job?

We have a job where the purchase direct flag is set resulting in suggestions to buy a part where we have plenty in stock confusing our buyer. I’d like to proactively identify all parts with this flag set as it’s not wanted, where does this field originate from(can’t find it on method of manufacture or on the part).

It’s the Non Stock flag on the part.

The Non-Stock Item indicator controls the default Purchase value for material requirements in Job Entry. Non-stock items default as “Make” or “Purchase” when they are entered in these programs .