GSTR1 for aug - oct

chandra (director) (62 Points)

10 December 2017  
As per gst web site , gstr1 is to be filled by 31st dec.
but when we are submitting the gstr1 an error is showing - "Save/Action on counterparty Invoices/Submit are not allowed for current date. please visit gst website for details on GSTR1 timelines "

What does it means ?? if this is not the time then when will be submit for 31st dec cut off date for 3 months data.

please suggest