How to capture username of the login user in Oracle fusion Demand Management measure?

Summary:

How to capture username of the login user in Oracle fusion Demand Management measure?

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In Oracle Fusion Demand Management, we have a custom measure created and wanted to capture the login username of the current user in the measure. We don't see any pre-defined function that can be used in the expression to get the user name. How can we get the user name?

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