<p>Hi! I have to build a report using data from three different xml data sets. At times, I have to pull data from two or all of them for use in one table/chart (like summing various amounts pulled from each). The data sets have no common columns. I was able to create a joint data set out of two of them, despite there being no common columns. This seems to have worked for my purposes, even though Birt documentation advises against it (joining data sets that have no common columns). But now, for some reason, I am unable to join this joint data set with the third data set. I'm stuck and wondering: </p>
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<p>Am I going about this the wrong way? Is there a better way to do this?</p>
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<p>Thanks!</p>
