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Antonio Jesús Criado ManzanequeAntonio Jesús Criado Manzaneque 

How to prevent the StandardController from loading data (parent object) in VF fields

I am developing a VF for a Quick Action button (Salesforce Classic Publisher) and I am using standardController to load my inputfield (possible picklist values with the '--None--' value as default).
<apex:page standardController="Case" extensions="Apex_Controller__c"/>
<apex:inputField value="{!Case.MiCampo__c}" required="true" id="entidad"/>
It works properly but when I access to my VF from another Case object the inputField take its value from the parent object as default.
How can I prevent this?

Thank you all.