post to quality inspection in PO but GR doesn't

Hi Expert

My Scenerio is releated to PGR

Business needs the material to go into quality inspection after PGR,

for that we have set in material master - Quality management view- field (post to quality inspection) as well in purchasing view.

In purchase order i found the stock type- Quality inspection but during the PGR stock type gets changed into unrestricted & material moves in unrestricted stock.

Please advise,what could be the reason?

Thanks in Advance

Nilu