Difference between GSTR-1 and GSTR-3B

pallab saikia (SERVICE) (96 Points)

30 September 2021  

Dear Sir,

One invoice mistakenly not shown in GSTR-1 of August'21 but same invoice was shown in GSTR3B of Aug'2021 paid accordingly, then what will be the amendment procedure to show the same invoice in GSTR1 of Sept'21.

Please advice