Thanks a lot Lukasz, I had the same like the example except the expression of the validation. I misunderstood the param-name=“expression” - It was the expression to evaluate!!! (i was thinking about the expression to fail the validation)
>> <param-name=“expression”>[!CDATA[#personBean.levels.length==0]]>></param> <para-name=“expression”>[!CDATA[personBean.levels.length > 0]]>></param> Unfortunately it still doesn’t work and i don’t any idea why the form display always the error message. Un saludo, José A.
