The scenario:

I have a payment form where the user select a supplier by choosing from a dropdown menu.

The user can edit supplier's data by selecting one from the menu and clicking the "Edit" button. After editing (or canceling) changes, it returns to the payment form.

So,

I need to get the value of a <h:selectOneMenu> populated by a <s:selectItems> by using a <s:button> or a <h:commandButton immediate="true"> - without submitting the form.

If I submit the form, the whole validation phase takes place and that's not what I want.

Any ideas?