I have a GST invoice from supplier for the month of March 2018. When I look into GSTR2A, there is no details for this invoice. When I want to add this invoice manually in GSTR2, it says that,” GSTR2 Save/Action on Counterparty invoices is not allowed for the current date, Please visit GST portal for details on GSTR-2 timelines. Kindly advise what should be done. Please find the snapshot attached here in this link of google drive. https://drive.google.com/open?id=1zqKUn3g5nGSO7o33LeEi3K9k-DG1c1DE
GSTR-2 has not been enabled at this point. So you can not file this return. The only solution available for this problem is to ask your vendor/supplier to amend their return and include this invoice.
This return filing mechanism is expected to revamp in 6-8 months until such time you will have to manage with your suppliers/vendors.