JbiValidator calls the setAttribute to the old value when validate fails

I tried to implement a Custom Validator by extending a JboValidator Interface. I applied the validator to an attribute. I tested the the validation on a JSF page. When I input an invalid value on the attribute, the validator runs but the problem is the framework sets the value of the attribute to its old value by calling again the setter function (setAttribute()) which in turn calls the validator again.
This is what I have observed. If this is what the framework really does, then how can I suppress the firing of the validator when it sets it back to the old value?
regards,
Anton

Thanks to all for your responses. Regarding accessing of new value inside value change listener, I am sure ValueChangeEvent.getNewValue() is not going to give me the value with proper data type. I am not using immediate attribute anywhere but use custom domain data type with masking (i.e. Formatter Format). Also I use InputDate field. Always valueChangeEvent.getNewValue() gives me the string representation of the value but not with actual data type.
Question:
1. Is there any API, that gets the valueChangeEvent.getNewValue() and the UI components as parameters and return the data with proper data type?
2. I need to get the newly value with proper data type inside valueChangeListener. Is it achievable? If so, how?
Need your help.

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JbiValidator calls the setAttribute to the old value when validate fails

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