It has been asked for many times by customers to have the ability to do fixed quantity BOM items.
For example if you use 1 of a particular component no matter what quantity the production order is for you could set the item up as fixed quantity with the quantity = 1.
This would also be valuable if you were to want to adjust a BOM on a particular production order and call for a fixed amount of a component either on or not on the BOM. there are times it is not directly a quantity per item but a quantity per order.
You can manually consume components in any amount but we would like ot be able to setup the production order bom in advance if possible so the material is planned and if you create a pick the item and amount would be on a pick for the order.