I'm teaching the OCUM Administration course right now and one of my students wanted to group a volume report according to customers. The customer nick is always the first three letters of the volume name. I suggested to create a computed column with the customer nick (and then group according to this column):
Validation always fails with 'no column with that name', when it's clearly visible and looks like it's exactly this name ("Volume").
Edition: Standard edition of DataFabric Manager server Version: 18.104.22.16873 (5.0.2)