Where this request for an amendment to the returns is within a year of the original submission, we’re obliged to make the amendment and, if necessary, enquire as to its validity.
Pan ddaw’r cais am ddiwygiad i'r ffurflenni o fewn blwyddyn i'w chyflwyno gyntaf, mae'n ofynnol i ni wneud y gwelliant ac, os oes angen, holi ynghylch ei ddilysrwydd.