Treatment of invoice in GSTR9 & GSTR1 for 2020-21

Dear Sir,

Please clarify the GST treatment

(I) One invoice with outward tax liability of Rs.36000/- was shown in 3B for Dec2020 and tax paid.This invoice was not shown in GSTR1.This invoice was cancelled.No credit note has been given till date. Please let me know

(iI) If this invoice need to show in GSTR9 and which column.

(iii) Treatment of this invoice in GSTR1 FOR the m/o Augyst2021

Regards

Sanjeev Sharma