How to join 2 Subject Areas under Receivables Module in OTBI Analysis Report

Summary: We are trying to update an OTBI Analysis Report (Applied Receipts Register) where it uses the Subject Area 'Receivables - Standard Receipts Application Details Real Time'. We need to use another column (a dff column which has been enabled) from the Subject Area 'Receivables - Transaction Real Time'. When I try to use this column or any other ootb column like Truncations Number, the report returns blank value for the same. I have tried using some common columns like Accounted Amount CR to join these, but this did not work either.

Is there a way to join these 2 subject areas?