63. If the registration of a vehicle is cancelled at the time an application for the registration of another vehicle is made, or a fee credit issued following the cancellation of the registration of another vehicle during the month in which registration is applied for, the registration fees for the first ensuing month shall be reduced by the lesser of the following amounts:(a) the monthly fees fixed for the road vehicle for which registration is requested;
(b) the monthly fees fixed for the road vehicle whose registration is cancelled.