Sch 9ZD para 25
(1) Where a person who has made an OSS scheme return or a relevant non-UK return makes a claim under paragraph 31(7)(b) (overpayments) in relation to an error in the return, the ... return is taken for the purposes of this Act to have been amended by the information in the claim. (2) Where a person who has made an OSS scheme return or a relevant non-UK return gives the Commissioners a notice relating to the return under paragraph 33(2) (increase or decrease in consideration), the ... return is taken for the purposes of this Act to have been amended by that information. (3) Where (in a case not falling within sub-paragraph (1) or (2)) a person who has made an OSS scheme return or a relevant non-UK return notifies the Commissioners ... of a change that needs to be made to the return to correct an error, or rectify an omission, in it, the ... return is taken for the purposes of this Act to have been amended by that information.