Disabling secondary authentication for KM Links

Hello all,

We have created a webdynpro application deployed on portal.

This application shows KM Documents in web container using KM url links(e.g. http://<Portal_Server>:50000/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/documents/astro.GIF)

After loging into portal successfully, the iView used to show above WDApplication asks for authentication again.

How to get rid of this second authentication ???????

Thanks and regards,

Amol