GST RCM TURNOVER IN GSTR 3B

Dear sir/madam,

We are providing commission service to NBFC banking sectors. We have to entity one in proprietorship and one is Pvt Ltd, in company we charging GST and collecting and showing in GSTR 3B returns. But, in proprietorship we are not charging GST because of RCM applicability, here we are filling GSTR 1 and showing B2B invoices and in GSTR 3B we are filling Nil returns, because there is no option to show the turnover. 

Kindly advice me on this is it correct or wrong GSTR 3B we are filling in Proprietorship concern.

Thanks & Regards