TCode NWBC doesn't work on SAPGUI for windows when it is opened through portal
I am facing an issue that is quite strange. Our SAP Portal 7.4 SP4 is integrated to GRC 11 using Portal logical system object.
My need was to create a SAPGUI for windows link on portal which will open a SAPGUI application in its own new window(not a browser window). I achieved this by creating SAP transaction iView and selecting SAPGUI for windows with TCode SMEN using GRC system alias. Everything worked fine and it behaves as per need and the new SAPGUI window can open any Tcode screen but only NWBC. On typing NWBC it does nothing and no entry in the log file either is generated to investigate the issue. When I go to backend via SAPLogon pad to GRC and then type NWBC it opens NWBC browser fine. So it means there is something in SAPGUI for windows application which is blocking/stopping NWBC browser to open while going through portal OR there may be something else to look into.
Did anybody face the similar issue under my current scenario?
I will appreciate for any suggestion or ideas.