Eric,
??? No, of course not. Expert Caetano already explained. When you CONVERT the planned order to a Process/Production order, you also automatically CONVERT the planned order's Dependent Requirement to the Process Order's Reservation.
Typically, for one HALB, there can exist both Dependent Requirements and Order reservations at the same time, but they will be for different orders, not the same order.
Best Regards,
DB49