Planned Orders requirement date

Hello,

For a given requirement planned orders are created in MRP, these planned orders are then converted to production orders (in case of in-house procurement).

The finished material has a lot size key WB (weekly lot size). For example for a requirement of 50 pces with maximum lot size of 40, MRP generates 2 planned orders with 10 & 40 pces. The smaller quantity is always planned at first.

My question is, is there any possibility (setting) to plan the biggest (bigger) quantity at first?

Thanks in advance