Hi Nikhil,
you should read the links Gopi has provided to get familiar with EM and OER Interfaces.
A lot of more info is available in Service Marketplace under
service.sap.com/scm -> SAP SCM in Detail -> Event Management
and in the SCN community SAP Event Management
Tables in the backend are:
/SAPTRX/EH* e.g. /SAPTRX/EH_HDR for the Event Handler Header Table
/SAPTRX/EVM* e.g. /SAPTRX/EVM_HDR for the Event Message Header table
From your description i assume you want to send data from a Sales Order to update your PTA Event Handler. Is this correct?
Best regards,
Steffen