RE: Production Order with Non-Inventory Item consumption
I wrote a blog a while ago where I discuss Non-Inventory items a bit (there are some new features) which is here
www.sabrelimited.com/.../
In any case, my experience with non-inventory items is that they are often added to the BOM to track their need more than for their costs. In most cases that I've seen in the past, they are expensed when purchased and therefore are usually part of the manufacturing overheads. examples like packing tape, welding wire etc. You need them - but they were costed as consumables and are not part of the BOM.
If you need to consume the costs of an Item against a production order, by the nature of the costing it needs to be an inventory item with a quantity. That way it can credit some account and debit WIP.
I think some other ERP systems don't transact against the G/L in real time with the consumption. They can get away with this kind of thing,
Not sure if that helps - but it does basically explain it.