Giving effect to the Order No. 2/2018 – Central Tax – The GSTN portal has enabled rectification of error or omission in respect of the details
furnished in GSTR-1 for any periods of FY 2017-18, till the due date for furnishing the details under subsection (1) for the month of March, 2019 or for the quarter January, 2019 to March, 2019.
The GSTN portal has also enabled the extension in the due date for availing ITC on the invoices or debit notes relating to such invoices issued during the FY 2017-18.
Read more at: http://www.cbic.gov.in/resources//htdocs-cbec/gst/ROD_2%20of%202018_CT_English.pdf;jsessionid=979A61732F90DE7AB9EBD77687EE9184