Validation Class and more then one callback functions on the same field?

[eluser]felyx[/eluser]
Well I tried to apply two validation callback methods for the same form field but it just won't execute the second one. Tryed to exchange them with each other and the first always works second doesn't. Am I doing something wrong?

Edit: if it is not avaible and you won't make it avaible then the documentation should say something about it, so ppl won't run into this problem