Hi Hilary,
thanks for your advices thats works all the time.
i have a question about formula and xpath :after editing the formulat : @name[@id = current()/Client]
the xpath is:
xdXDocument:GetDOM("clientnames")/clients/client/@name[xdXDocument:GetDOM("clientnames")/clients/client/@id = current()/my:Client]
and the expressionBox display the first items whatever the choice from the dropdownbox
once i change a part by ".." and the xpath became:
xdXDocument:GetDOM("clientnames")/clients/client/@name[../@id = current()/my:Client]
the expression box display exactly the item chosen in the dropdownbox.