OAS version 12.00.0043 now uses OracleManagedDataAccess assembly which does not support TNSNAMES.ORA.  You can set the entire path from the TNSNAMES.ORA file in the Database field of the data logging, alarm logging, or recipe group directly.

Use the following as the Database name:

(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=MyHost)(PORT=MyPort)))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=MyOracleSID)))

As example for a system with a computer name GWDESK and the Oracle database name OPCDb:

(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=GWDESK)(PORT = 1521)))(CONNECT_DATA=(SERVER= DEDICATED)(SERVICE_NAME=OPCDb)))

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