R3483 is generated B message instead of E for an OP

Hello,

I've the case, where a purchase order was created for a need in another branch plant. The purchase will be deliver in 10 to 14 days. Then the need has been change because the quantity has been raised and the need is earlier. The MRP (multi plant) is run and the message is to create a new B order to cover the need. We were expecting to have an E message on the OP transaction and a O order.

What is the priority for the program between creating a new B order instead of generating a E message.

We are not using the G and L message.