PO Order Type Determination for Shipment Cost Document

Hi Everyone,

During my shipment cost creation I am having a problem because MM had defined in a standard way PO Type ZREV (that it is not for Fregiht) and I have an error. We know that MM can only determine one PO order type in a standard way.

How can I do to define order type (ZTRA) that is a specific order type do freight cost during the shipment cost creation?

Thanks a lot,

Marcos