Believe you are going to have to try an alternate posgresql odbc package .. I have seen people say there are compatibility issues between unixODBC and postgres odbc...
I was able to get hana to create the remote source however i was unsuccefull on getting the data.. I tried 9.4 with authorization error.Have seen forums using 9.0.. Above i was using 9.03 when hana was on suse 11 sp2
downloaded the postgresql odbc source tar.
unziped
./configure --without-libpq
make
make install
Driver showed up in /usr/local/lib
Created an .odbc.ini
configure hana and connected.
PostgreSQL: File Browser
I tried a few different versions, however i ran into different errors about: not getting objects already connected..
isql however connected each time as admin and as hdbadm.
may take a little effort but once you find the match I think you will get farther than you have so far.
Good luck.