This is actually a limitation of Visual Analytics at this stage, as according to the documentation, a custom sort does not work if the data item is assigned to one of the legend data roles (either Colour or Group). The same restriction applies when sorting on the raw values of a data item that has a user-defined format. Creating a user-defined format is a possible workaround. Instead of having your Risk Rating - Raw column having values such as AA, A, B1 etc. you would have the column as a number format (1, 2, 3), then add a user-defined format to invoke the Risk Ratings (example, 1 = ""AA"", 2 = ""A"", 3 = ""B1"" etc.)
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