Hi Eric,
There is no link in case of MTS process. If strategy is maintained as 40, Warehouse sales order can only consume the PIR(Planned independent requirements) maintained for the material immediately upon receiving the sales order. If you want to maintain PIR and at the same time planned order/process order require the link between the sales order then use strategy 50 for FERT material and in MRP4 view 2 for all dependent materials. In this case all the dependent raw materials will be planned upon MRP run based on PIR maintained for FERT material. For FERT and all dependent semi-finished materials planned orders will be generated with sales order link and can be convertable only after receiving the actual sales order.
Thanks & Regards,
Ramagiri