Once a return is lodged it can only be amended by ECSA representatives. In your Returns Summary, click the Action box on the right of the table and select ‘Request to amend’.
A pop-up will appear asking you to provide a reason why an amendment has to be performed, and a description of exactly what requires modification. Fill this in and click ‘Request to amend’. This will then be sent to ECSA representatives to review. While the request is being processed this return will show as 'Pending' status.