Page tree
Skip to end of metadata
Go to start of metadata

The below link provides the information on activating the virtual time hierarchies in BEx.

http://help.sap.com/saphelp_nw73ehp1/helpdata/en/1f/83813ec8d3fe3ee10000000a114084/frameset.htm

We can also use Tcode RSRHIERARCHYVIRT for the same.