Add EP-userid to BSP app as (URL) parameter

Hi,
I've created a default BSP-iView (via com.sap.portal.appintegrator.sap.BSP) and try to pass the EP-userid as an extra parameter, without any result so far. I've checked several SDN posts, but didn't help (or I didn't understand them).
In the properties of the iView I've tried to edit the following:
Application Parameters : user=<User.UserID> or
Parameters to Pass from Page Request (for URL isolation) : user=<User.UserID>
I need to pass the EP-userid, because the BSP app. is called with one user (user mapping for a specific Group/Role for the backend system) and is not able to distinguish the logged on EP-user.
Where did I go wrong?
Any suggestions how to solve this issue?
Best regards,
Mark

in the application parameter of the BSP iview pass
userid=<User.LogonUid> or
userid=<User.UserId>
and in the BSP application have a page attribute called userid with auto check box checked.
within BSP application now the variable userid will have portal logged on user id.
also check this thread
Disable Variable Screen issue
Regards
Raja

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