Export invoice missed for jan 2018 in 3b & gstr1

Kamalpreet Singh (24 Points)

01 September 2018  

We have missed to enter Export Invoice details in GSTR 3B & GSTR 1 for January 2018. How can we correct this error to claim the ITC refund. GSTR1 has been filed till April 2018, but we have realized this mistake now. Kindly help