Search Help for Route - VA01

Hi All,

I need help in assigning search help to ROUTE(VBAP-ROUTE) field in VA01 Transaction.Instead of standard F4 list I need a list of Routes from the Custom table which will be maintaned.This new F4 list has to be displayed based on order types...Means only for order type ZXXX it should show the new F4 List, for the rest of the ordertypes it should show the standard F4 List.

P.S : Search help H_TVRO is assigned to the Route.This Search help doesn't have Search help Exit or Append Search help options.

Your help is highly appreciated.

Thanks.

Satyan.