Missed B2B bill in GSTR1

Prem Kewalramani (292 Points)

28 January 2019  
In one of the previous GSTR 1 of 2018-19 I had by mistake not mentioned bill of one party in B2B...bill no is very much there in doc list..but the amount was in B2CS...now how can I show this one bill in Amendment in Return of Dec 2018...