Hi Cyrille,
1. Yes, system will create "on order" issue transactions for raw materials from BOM as soon as picking list is generated. This is a demand for components that can be fulfilled either from existing on-hand inventory or via purchase order created manually or automatically by master planning.
2. "Ordered" receipt transactions for item from production order or batch order will be generated when that order is estimated. This is a supply of FG item.
Sales order does not play a factor in this scenario. It can be used to sell FG item, for example, when it is made via finished production order.