Video: FDMEE 11.1.2.3 Mapping concepts
We like to encourage you to take a look at this video: Oracle Hyperion Financial Data Quality Management Enterprise Edition (FDMEE) 11.1.2.3 Mapping concepts Doc ID 1584133.1 if you considering the implementation the Account Reconciliation Manager module of FCM.
Even if you are already familiar with this subject, this video may provide you that little extra information you were after.