How to assign apex_user in tabular report

Hi,
I have created a tabular report. Under report attributes / Tabular Form Element I have set the Default Type to (PL/SQL Expression of Function) and under Default (:apex_user). It looks like using :apex_user does not give me the username but if I instead of :apex_user say use sysdate it does give me the date.
thanks so very much
-ahmadii

Sorry, it should be :app_user not :apex_user.
thanks.

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    Hello DP,
    >
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