Hi @Jeffery Murray!
But if you mark them with "Direct issue items" they are not requested to the store because they are to request a direct purchase and you don't have to reserve anything because it doesn't impact the stock.
Do the following test. Configure a material in the jobplan and define a store (in the "Material" tab of the jobplan"). Save and then, check "Direct issue" and you will see that the store disappears... that is because that material is not requested from the store if not to create a purchase requisition.
Do exactly the same test but remove the check "Direct issue".
Regards!