Bug: ""Your table must have exactly four data sets..." when making a three-way graph

Prism 7 introduced a new kind of graph to plot data entered for three-way ANOVA.

This works fine when you are plotting data from a data table. But if you transform the data, and then try to make a three-way graph from the results, Prism won't give you that choice but instead tells you in the New Graph dialog, ""Your table must have exactly four data sets.". 

Workaround: Copy the results, create a new data table, and paste. Then you'll be making the graph from a data table, which works fine.