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A good way to think about Appends is - use them if you need to add a column to a report that requires filters different to the rest of the report.
In this scenario our main report will look at invoice figures by country in 2014. The column we want to add is the invoiced figures in 2013. The filters Year = 2014 and Year = 2013 conflict, so the additional column will have to be added through the append.
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