Hello Teja, Thanks for your reply. I am trying to calculate for a periode, for example from 1-1-2014 to date (in february 2015 the periode to calculate is 1-1-2-14 to 1-2-2015, or in June 2015, the period should be 1-1-2014 - 1-6-2015). Have you an example that shows me how I can manually calculate this. Thanks again Regrads Chris keen
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