Custom fields on Shopping Cart in SRM 6.0 SP03

Hello All,

I have made a WD enhancment and added my Custom fields on the Header tab of the Shopping cart.

But the fields are static as of now, as i am not able to handle the fields in the Post and Pre-exit methods of the Web dynpro enhancement.

CAn anyone guide me regarding this. Handling custom fields in SRM 6.0 SP03.

Regards,

Gautam