How to avoid validation while navigating to the next train station..11g u2

Question

Hi,
I have a case where I use the same view object across the train stations while entering the data.
My problem is, when I click the Next button it gives an error saying that I am missing some of the mandatory fields that are exposed in the coming screens.
To make it more clear..
Say that I have an employee vo having (*id , name, surname, department, salary ..)
I create a train taskflow and create two page fragments one for entering id, name, surname and the second one is for department and salary.
When I try to navigate to the next train station after entering fields in the first one I get an error saying that "salary is missing" .
What should I do to postpone the model validation until I commit something?
Thanks

Answer 1

try using postback to avoid validation again...
        Boolean l_postBackValue = (Boolean)JSFUtils.resolveExpression("#{adfFacesContext.postback}");
        Boolean l_defaultBooleanValue = new Boolean("false");
        if (l_postBackValue.equals(l_defaultBooleanValue)) {
        }