If you are talking about TR created as result of GR posting, you may check the storage location control setting @ IMG -> LE -> WM -> Interface -> Inventory Management -> Define Storage Location Control -> Control of Assignment "Plant / Stor.Loc. - Whse Number".
1) Check if "Do not copy stor.location in TR" indicator is set for the plant/s.loc to which the GR was posted.
2) Check if you have one storage location set as standard storage location for your warehouse