How to Disable Duplicate Supplier registration Notification

Scenario :  We are using the "Register new Supplier" function to register new suppliers. Suppliers are registered only by Client users and not by suppliers directly.  Hence when we try to register a supplier with the same Tax Reg Number or Tax Payer ID as one of the existing Active/ Non-active supplier the system sends a notification to the first contact of the existing supplier. How to stop this notification, as we dont to communciate any notification to supplier for a wrong data entry by users.

thanks

Rajaram