Hi Ravi,
Triggers are not supported by SAP for use on SBO system tables so I don't recommend you integrate your messaging in this way. Instead, you could put your code in the SBO_SP_TransactionNotification stored procedure. This will be called by the SBO client (or the DI API) when a business partner is added (ie when @object_type = 2 and @transaction_type = 'A') so you can add your code in here.
Kind Regards,
Owen