Gst 3b related query

Dear CCI Members,

Please resolve my query which is :

I have purchase of exempted goods in July month and in August Month I did not purchase any exempted goods but Returned the exempted goods purchase in July Month so in GSTR 3B 5 no. Column of Exempted goods & Nil rated Inward Supply this figure is not taking becuase of Negative Figure.Then how to show this.

Thanks & Regards