ValidWhen is only available in Struts Version 1.2 and above. You had mentioned in another thread that you're using Struts 1.1, so unless you've upgraded, the validWhen rule isn't going to work at all.
Secondly, I don't believe that your statement:
if the first condition fails(validwhen), the second shouldn't happen.
is necessarily true. I've looked through the documentation and haven't found anything that says one way or the other. My understanding is that a required validation rule will apply no matter what, regardless of its position in the list of validation rules. As I said, though, I haven't found statements to prove or disprove this in the documentation. If your statement is based on something you read in the documentation, please give us the link. [ September 07, 2007: Message edited by: Merrill Higginson ]