I'm looking into the Parent Child Hierarchy in PowerPivot/DAX. Below are some useful articles I have found.
parent-child-hierarchies-in-tabular-with-denali
PowerPivot Denali: Parent child using DAX
However, when I tried to implement the PATH function in DAX, I got the following error.
=path(rptHierDate_rptHierDate[TREE_NODE_ID],rptHierDate_rptHierDate[PARENT_TREE_NODE_ID])
Below is a screenshot of my dataset. I have checked column TREE_NODE_ID has no duplication, and all values in column PARENT_TREE_NODE_ID exist in TREE_NODE_ID
I'm not sure why am I getting this error. Any idea is appreciated!