A certificate shall not be issued to a candidate who, after the final assessment, is found to have insufficient qualifying service: Provided that the Authority shall issue the certificate if it is satisfied that any error in calculating the qualifying service was not due to the candidate's own fault or deliberate misrepresentation and the candidate has made good the deficiency in qualifying service. If it is found that the candidate made the error deliberately, the certificate of pass shall be withheld until the candidate has completed an additional 12 months' qualifying service, such service to count only when completed after the date of final assessment and not to count as qualifying service for any other certificate.