Storage Location is not shown

For material type <b>"STOCK ITEM"</b> when I use account assignment category as Cost Centre "K" in the PO and enter all the information such as Plant, Storage Location etc, Storage location is then not shown in the <u><b>GR</b></u> under the tab <b>Where</b>. however it is shown if i am using material type <u><b>Non valuated</b></u>.

Can someone please let me know how to fix it, as we need to have storage location to maintan the stock?

Please help

Regards,

Farooq Rifai