Is it possible to have two subject areas on the same OTBI report

Summary

Is it possible to have two subject areas on the same OTBI report

Content

Here's the requirement.

We want to pull Subledger (AP) to GL Details along with Matching po number information. GL Subject area gives the identifying PO which is at the header level and not always populated. So we want to add Payables - Real Time transaction to the existing BI report and pull payable information. Is that possible?