Manual Batch creation in production order

Hello Friends,

I want to create the batch number manually in the production order.So that's what i have deactivated the automatic batch creation in the batch management configuration.So when i create the production order system is not creating the batch number automatically.Upto this its fine.

But my requirement that since system is not creating the batch number automatically,and if i don't give the batch number manually in production order than also system allows me to save the production order.I want that unless i give the batch number manually in production order, system should not allow me to save(or create) the production order.

How to do this?Plz share your knowledge.

Thanking you.