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How do you tell which ones are broken? Well you have to change them all to just be sure.
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Turns out you actually get this if even just a single field in your document is ‘broken’. So I’ve moved machines, copied my files across and for some reason my mail merge has soiled itself and now bleats “data source ‘SOURCE’ was not found” which is as unhelpful as it is infuriating, especially given that the “check connections” button is exactly the wrong place to look for an answer. So another year on, LibreOffice 4.2.7.2 (via Linux Mint 17.1) still has a dog’s breakfast of a mail merge feature, hey ho, hopefully it might actually get fixed following the fork from OpenOffice and the change in contribution methods.
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