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<p><span style="font-family:calibri;">Version: Mars.1 Release (4.5.1) Build id: 20150924-1200</span></p>
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<p><span style="font-family:calibri;">I have built an aggregation extension point that is an extension of the IAggregationFactory interface to provide the difference between the current row value and previous row values. It seems to work just fine and I’ve been able to bring it into BIRT as a plugin. However I get some strange behavior when I use it in a table with groups. Specifically I can’t get aggregation to work in the column where I use or reference the output of the aggregation extension point. The following one group of the resultant table (see PDF):</span></p>
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