i found it , previous reply..

on the subject of character limits , also actions are limited :

Actions are another special kind of functions. They don't have parameters and don't return a value, but will appear in the action pop-up list in
WED's entity property panel. So actions can be assigned to entities through WED, and are automatically executed after level loading. Action
names are limited to 20 characters. Besides that, there is no difference between functions and actions.

just in case.