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To pass an error to a calling program, you can use one of two methods. The method you use depends on when you want the error message to be produced. With the first method, Oracle OLAP produces the message immediately and then the error condition is passed through the chain of programs. With the second method, Oracle OLAP passes the error through the chain of programs first and then produces the message. See "Passing an Error: Method One" and "Passing an Error: Method Two" for details.
With both methods, the appropriate error handling happens in each program in the chain, and at some point Oracle OLAP sends an error message to the current outfile.