What is the validation? What version are you in?
There are some item validations that execute automatically based on settings like 'Required'.
Date pickers has other attributes that can declaratively validate range.
The validation is a mandatory field check. The version is APEX 4.1. How to get rid of it? I have the same validation executed twice and shows up in the error region twice. How do I get rid of the automatic execution.
Edit the item properties and set Required setting to 'No'.