Oracle C/ODBC connection

Hello I’m trying to connect a navision 2.60 database (fdb) with Oracle 9i using the 2.60 c/odbc driver. Every time I try to get data from Oracle I get the following connection error: ORA-28500: la conexión de ORACLE a un sistema no Oracle ha devuelto este mensaje: [Generic Connectivity Using ODBC][S1000] [9013]General error in nvITrans_BeginT - rc = -1. Please refer to the log file for details. ORA-02063: 2 lines precediendo a NAVISION Any ideas? The c/odbc connection works fine when exporting data to Excel, and Oracle can communicate with Excel via odbc. Toni