Gross Planning Strategy

Hi Gurus

Iam using Make to stock gross requirement strategy.

I have created planned independent requirement in MD61. Also created material Bom

It created planned order, I can see BOM in planned order.

When I convert it into production order then it did not copy bom automatically.

Bom component cannot be seen in production order and I got information message -- BOM for planned order 999419934 not valid for orders

When I did reread masterdata then all Bom components can be seen in component list.

Why bom is not copied automaticslly when i first time try to convert from production order.