OBIEE 12c - the correct location for the tnsnames.ora file

Where is the correct location for the tnsnames.ora file in OBIEE 12c?

Create or copy your tnsnames.ora file to 

         {DOMAIN_HOME}/config/fmwconfig/bienv/core  

(e.g. /.../Oracle_Home/user_projects/domains/bi/config/fmwconfig/bienv/core/tnsnames.ora)

Note: This would also include other OCI files, such as sqlnet.ora if used.

This is documented in the Metadata Repository Builder's Guide for Oracle Business Intelligence Enterprise Edition 12c

see: Setting Up Oracle Database Data Sources