It would be great if there were three tick boxes when creating a product.
1) I buy this product
2) This is a component product for assemblies
3) I sell this product
When going into the purchase order screen and inserting order lines, the dropdown only lists the products/ingredients you actually buy from suppliers.
When going into the sales order screen and inserting order lines, the dropdown only lists the items that you actually sell to customers.
This already happens in the production/assemblies screen, as you can only see the items that contain a bill of materials.