I need to validate also server side, i started creating a module following a tutorial online.
Every example that i've found overrided Magento's standard attributes. What should i override to validate my custom attributes? Which event should i catch? I'm a bit confused...
UPDATE : here is a zip file of my module https://www.dropbox.com/s/7nxjx6mh0hly6yn/MyModule.zip?dl=0. Let me know if you spot the error.