RENT RECEIVED BY PETROL BUNK OWNER ON TANKER FROM IOC

Dear sir /Madam

one of my client having PETROL Bunk
he RECEIVED Rent from INDIAN OIL COMPANY for using his Tanker for transportation of PETROL from storage point to Petrol Bunk...but our didn't raise any invoice on IOC ,Company transferred monthly to BANK account.
Amount is not a fixed one depending on Tanker capacity.

while filing GSTR-9 And 9-C where we have report and reconcile..
But in Audited Financial statements it's shown P& L as separate item Tanker Rent...
How to declare in GSTR-9 & 9C

THANKS IN ADVANCE