It is because it is presented as hierarchical list.
If you clear the IndentationColumnName and IndentationControls properties on the repeater control, the sorting on columns works.
However, it means that the parent/child relations become unclear, so I would be careful changing this.
Strange in 2013 R2 the feature with IndentationColumnName combined with interactive sort does work.
(for the same page) Has 2015 lost some functionality?
Comments
If you clear the IndentationColumnName and IndentationControls properties on the repeater control, the sorting on columns works.
However, it means that the parent/child relations become unclear, so I would be careful changing this.
Microsoft - Dynamics NAV
I know what to do (or what not to do :-) )
(for the same page) Has 2015 lost some functionality?