Stock transfer in mrp area

Hello all, first of all forgive me if I posted in the wrong place or this problem has been discussed.

I set up MRP area type Storage Location because I want to do the production and consumption for a material in different storage locations.

So far so good but I have a little issue.

When I do MIGO stock transfer rezervation (A08->R09) to transfer stock from storage A to B, the field "storage location" is blank (field LGOBE).In this field should be the storage from which I make the transfer or storage for material production.

It is a way to solve this?

Thanks in advance.