MRP by Storage Location (change mov.type and set default stor.loc to GI)

dear all ,

We are running the MRP by Storage Location thru MD01 or MD03.

It means that we got a Reservation with movement type 311 and no Storage location is

determinated in the reservation.

Does anyone know the way(customizing) or know some user exit to set a default storage location

of goods issue in the reservation and also in some cases changes the movement type 311 by

a Z movement ?

best regards,