I have a file which has one column which contains Danish Krona amounts for various products. In order to express this column in other currencies I am using a calculated measure. For USD the syntax is USD = sum(DKKamount) * 0.1143 This works fine and shows the currency conversion but when I close down the file and reopen it I get an error message saying that it doesn't recognise the data. Could you explain what causes this error and how it could be fixed?
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