Call the remote function using:

RFC_RC SAP_API RfcCallExt(RFC_HANDLE handle, RFC_PARAM_SPACE PSpace, char * function);

The parameter PSpace is a pointer to the stack area where parameters have been stored.

The function RfcCallExt returns after sending the call request, and returns either RFC_OK or RFC_FAILURE.

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RfcCallExt can fail because you called RfcOpenExt with an invalid password. See RfcOpenExt for more information.