When a formula item is substituted for another - the system grabs quantities based on available on-hand inventory.
Ex - ItemA - 150, ItemB (sub) - 50
When backflushing the components, both are posted each time in the same proportion as they were on ProdBOM.
Ex - ItemA - 15, ItemB (sub) - 5
Some customers would prefer to consume ItemA first, then ItemB.
This would be a change in design and this idea is posted for tracking purposes to see how many others would like to see this design change.