How to fetch Item and serial number in OTBI report with Subject area "Inventory Balance Real Time"?

We're trying to build an OTBI report with the fields Inventory Organization, Part Number, Sub-inventory, Locator, LOT Code, Serial#, Qty. We're able to fetch all the fields from 'Inventory - Inventory Balance Real Time' OTBI subject area correctly except the Item Number and serial number.
Please suggest how we can fetch these two fields in an OTBI report.