Doubt in Customer Exit

Hi Friends,

I have a simple requirement in Customer exit. I am using a default variable which displays year 2005. If user enters year < 2005 then I want to prompt a message displaying "Enter year value > 2005".

If anyone is having any good document or link please mail it to my mail id zaks_bw@yahoo.com.

kindly get back to me at the earliest.

Thanks in advance.

Zaks.