Hello,
In Manual Reorder Ponit planning (MRP Type VB) the system only considers the inventory levels and compares this invenotry levels vs the reorder point quantity entered in the material master to define if a replenishment order needs to be created.
This meand that the system will not condier your customer orders, dependent requirements, forecast, planning strateg, etc.. etc,..
If you want to plan considering customer oders, then you should not use MRP Type VB. Try with PD or V1/V2.
Kind Regards,
Mariano