If this field is null Name_the_issuer_if_different_to_client__r then i want to replace with Client_Name__r.
can you help guys

IF(ISNULL(IBC_Booking_Form__r.Name_the_issuer_if_different_to_client__r.Name),IBC_Booking_Form__r.Client_Name__r.Name,IBC_Booking_Form__r.Name_the_issuer_if_different_to_client__r.Name)