tnsnames.ora overwritten during startup

Hello,

New installation of Oracle Forms 12.2.1.3.

There is a file tnsnames.ora located in {domain_home}/config/fmwconfig

I am used to put this file manually in this directory. We have one file with many DBs common for all environments.

But this file is overwritten by some "default" one during each restart of the managed server:

#

#

# sample tnsnames.ora file

#

# sample entry

#<ALIAS> = (DESCRIPTION =(ADDRESS_LIST =

#              (ADDRESS = (PROTOCOL = TCP)

#              (HOST = <HOST>)(PORT = <PORT>)))

#              (CONNECT_DATA = (SID = <SID>)))

#

#

Is this intended behaviour? I cannot find it in any documentation.

How can we avoid it and maintain our version of tnsnames.ora?