Gstr 3b purchase return enterd as itc reversed by mistake, then how to enter in gstr 9 annual retur

to my best knowledge purchase return will come under that head only..

i.e. ITC reversed 

for suppose ITC TO BE  AVAILED 10000(TAX VALUE)

ITC TO BE REVERSED                - 2000(TAX VALUE ON PURSCHASE RETURN)

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NET ITC AVAILABLE IS    8000/-


lets experts comment on it..

not that,actual purchaase return we  deduct from actual purchase ,so not enterd in different column only net of amount enterd in  itc available