Problem running a 4GL program with an stored procedure

We had a system that used STORED PROCEDURES(Launched via an ODBC
connection) to execute 4GL programs that generate TXT files (data
delimited with "|") that were loaded then into another program.

We have migrated to the new INFORMIX 11.50 and when we try to run the
stored procedures there is an error produced:

Error: The system command cannot be executed or it exited with a non-
zero status. (State:S1000, Native Code: FFFFFD64)

The stored procedure that we create is:

CREATE PROCEDURE test()
SYSTEM 'fglgo /disco2/bexe/sgfreversiones.4gi';
END PROCEDURE;

And we execute it:
EXECUTE PROCEDURE test();

Information on our previous system:
INFORMIX 9.4 running on a Sun SOLARIS

and now:
INFORMIX 11.50 running on Linux RED HAT

Any hints and help would be appreciated

Roger Camargo
Cochabamba - Bolivia