BBP_PD equivalent for modifications ? :-(

Hi guys,

With transaction bbp_pd we can display the PO document (Shopping carts, etc...). I would like to know who can I modify a PO document using a transaction similar to this.

My main problem is: for some strange reason I lost the storage location field in my PO document. Now I need to enter it again, but the field dissapeared from the screen =( So, Im looking for another way to modify the PO document..

Any idea ?

Thanks so much for your help,

Kind regards,

Diego