Cant edit my Listviewer?

I have a list viewer and want to edit it, after I already saved some dato for some kinf of Logbook/tracker, but I cant get it to work, does anyone see my mistake and can help me with it? Thank you

Hi, in the event “after text input” you validate that “is number” and next another validation “> 0”, that block return true of false, remove and try again.