(1) The approved trustee of a scheme shall check that the arithmetical  calculations of the arrears and contribution surcharge payable by a defaulter are correct having regard to the remittance statement lodged by a participating employer, or to the information given by a self-employed person.

(2) The approved trustee shall notify the participating employer and the Authority of the discrepancy. 

(3) The trustee shall require the employer or person to rectify the discrepancy as soon as the approved trustee notices a discrepancy between the relevant calculations in respect of the arrears or the contribution surcharge, and the amount received by the trustee as arrears or as the surcharge practicable.