Trigger Idoc

Hi Experts,

Scenario - After creation of sales order data will send to 3rd party system. Now what happen output master data not maintain in the system so all the SO created without Idoc generation later delivery and invoice created. Now client want to send those SO details via Idoc with out canceling delivery and billing. I tried with program - RSNAST00 but output is not generating.

How to resolve??

Regards,

S