Error while PGI... Special stock 2010 Q for this mat. does not exist

Hi friends,

While PGI system is showing error that particular material, and wbs element special stock Q in sloc 2010 stock does not exist.....

But stock is present.....

I hve checked all relevant things reg..... stock and reservation...

We are facing this issue for PGI for free of charge.........

Plz. help......

Thanks

Navin