Gstr 1 filing

SEE WHETHER THE SAME NUMBER INVOICE IS THERE IN GSTR_1 

GSTR 1A IS NOT AVAILABLE YET...

IN GSTR_1 

yes exactly check it 

Normally, if we enter the same invoice no. it shows immediately that "invoice already entered".. anyway I will check it out once again.  Thank you.

Got the mistake.. actually one of our client has changed their GSTN in the month of March, 2018.  We have issued a invoice to them on 31.03.2018 mentioning the new GSTN only. And one more invoice was issued in November, 2017 with the old GSTN.  But the receiver had filed a modification for the invoice issued in March, 2018 and updated the old invoice which was issued by us in Nov., 2017.  what action has to be taken now? whether I can accept or reject? if I accept is there any change in our liability?? please suggest.