business flow clarification

Hi All,

for my clients req we created one project in PS system. for tht one wbs and network was also created. And assigned one material to tht network and reserved.

for inhouse (manufacturing).

here i am not creating sales order. customer and manufacturer r different user in one company.

now i will rum MRP (MD51)and system will creates a planned order, then porduction order execution

finished goods issue to the network.

then settlement w.r.t. wbs.

if this scenario is correct then how BOM will explode while run MRP.

give me suggestions in this if any corrections.

Thanks & Regards

Deviprasad