Please help with 'ValidationErrorUsingMask' prototype

Hi,

I'm trying to override ValidationErrorUsingMask of TwwDBEdit (Sydney 4K), my code is 

procedure ValidationErrorUsingMask(Field: TField); override;

but it keeps throwing error:

E2037 Declaration of 'ValidationErrorUsingMask' differs from previous declaration

Please help me to know the correct declaration of ValidationErrorUsingMask.

Thanks.