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Introduction
It's possible to create a custom error message in the GUI from the event system. You can use this functionality for example in the OnComponentSavePre Event (e.g. to check values of fields before saving a Component).
1. Adding the code to your event system
Add the following code to your event system
Call Err.Raise(-10, "OnComponentSavePre", "No documenttype selected, this is a mandatory field.")
You can use every error number below zero (negative) and above 2000.