How to call ME21n Screen in webdynpro once you click any button

Hi exports,
I have created one webdynpro application..In first view i have one button which have action...Once i click that button
it should go to next view where it should diaplay standard Transaction ME21n screen..where i need to enter all PO details..finally PO should be created auotomatically like normal SAP...
Can anybody plz help me how can i acheive this?
Thanks & regards,
Praveena.

You have to create Transaction iView for ME21n in portal.
Call the iView using portal integration api
Web Dynpro for ABAP Portal Integration [original link is broken]

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read this document (from pages 7 ).
<a href="https://www.sdn.sap.comhttp://www.sdn.sap.comhttp://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/b5380089-0c01-0010-22ae-bd9fa40ddc62">https://www.sdn.sap.comhttp://www.sdn.sap.comhttp://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/b5380089-0c01-0010-22ae-bd9fa40ddc62</a>
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