Hi Anil,
For type T (registered server program ) RFC destination you will need to go to the folder where the external program (the program you would like to trigger at the external side) locates, and register it on the gatewayusing command:
<PROGRAM> -a <PID> -g <HOST> -x <SERVICE>
Here <PROGRAM> means the real program name at the external side. <PID> means the program
ID used in SM59. <HOST> means the gateway host, <SERVICE> means the gateway service.
For example:
rfcexec -a Test -g meinSAPhost -x sapgw00
The test program 'rfcexec' is registered unger the program ID 'Test' at
the gateway host 'meinSAPhost' at the port 'sapgw00' of the gateway.
SAP note 353597 has more information.
As for the external program that you need to register, the corresponding application (in your case
the BizTalk) should know it. In some cases people just use the example program provided
in SAP RFC library "rfcexec" for the connection.
Kelly