batch determination issue for some materials

Hi

For one material A, i am getting batch is determined.in delivery automatically.

For 2nd material B , not getting batch detrmined automatically.Needs to select manually.What might be the reason ?

1. maintained batch search strategy via VCH1 material wise

2. Material 2 is fully copied wrt material A.

     ( Batch mgt active in Sales:General Data , plant storage 1 view )

     ( material class type , class & char.maintained under classification tab)

Sachin  K