gstr1

can rectify errors in annual return I guess...other than this I don't see any way I can rectify such issue..

Rectify the same in Annual return

You can show that missed invoices in next GSTR1 returns.

it is treated as nil GSTR Return. so it should be reported in next month return. but system is not ready to upload in current financial year which are pertaining to last financial years. either wait till mapping last FY transaction or else upload through GSP/Asp service providers otherwise show in annual returns.