Error 5015 in known facts check

The submission for the user and tax year has already been successfully made. In order for the return to be filed online, the user will have to submit an amended return. Alternatively, the user can contact HMRC who can void the original return on their servers, which will then allow for the user to generate an original return and file online. Users are required to conatct the HMRC’s Online Services Helpdesk. The Online Services Helpdesk contact details are: email: helpdesk@ir-efile.gov.uk Telephone: 0845 60 55 999 Minicom: 0845 366 7805 Fax: 0845 366 7828