do you mean that it doe not work or is not even available in NPrinting template editor?
do you try to use it as a date column?
what is the label of this expression in the chart - is there any other label with the same name/value (repeated expression labels cause expressions to disappear in Nprinting)
maybe you have a LF (line feed) character in your expression and when you try to drag and drop tag to your template it is not fully transfered
There is nothing unusual about your expression so the fact that you have 2 sets does not mean anything. It is very basic expression..
Providing screenshots would help me understand context of your query. Right now I am bit confused what is not working; whether your chart does not work, or whether expression which should come as column does not appear in your tag list or whether it is something else.
cheers Lech, When applicable please mark the correct/appropriate replies as "solution" (you can mark up to 3 "solutions". Please LIKE threads if the provided solution is helpful to the problem.