having default value in Search help

Hi ,

I have a problem in search help.

i have two parameters on the selection screen

one is Company code - search help name Ybuk

second is customer No - Search help name Ykun

user will enter the value for the :company Code

when user trys for search help in Customer no it should display the Company Code

as default on the selection criteria of the Customer Search help.

please suggest,

Regards

Sudha