BOM explosion in subcontracting PR

Hi...

I have one issue of BOM explosion in subcontracting PR.

I have created BOM, routing & PV. Production version maintained in info record.

While creating manaul subcontracting PR , BOM is not exploded giving error message as "Not possible to determine any components".

I have checked validity of BOM, PV found ok.

Also Proc. type X & Spl. proc type 30 maintained.

Any suggestion to the problem appreciated

Regards

Tushar