Ravi,
Read the EDI Module Core Component User’s guide in the EDI package. Also check out the EDISamples package.
Essentially you need to do the following:
wm.b2b.edi:envelopeProcess
wm.b2b.edi.templateMgr:getTemplate
wm.b2b.edi.util:getEDIstring
wm.b2b.edi:convertToValues
This gets your EDI document into an Idata structure but you must load the standards first. The Docs and the EDISample packages are quite helpful.
Chris