I get the error "These columns don't currently have unique values" when I have more than one NULL parent value in my list. The element Ids are all unique but I always get the error. Please help.
Sample data
parentId elementId elementText
NULL 116 Text1
116 2108 Text2
2108 2109 Text3
2108 2110 Text4
NULL 72 Text5
72 655 Text6
72 660 Text7
72 672