[EpiData-list] Check file + calculation formula

Hello! I am trying to create a formula to calculate the sum of different fields. In "Edit" option under "Check" window, when I write it, I close it and save it, but later on I see that the line has been cut at the end, does it have limited number of characters or ...? and how to solve it?

Help!! :-)

Thank you a lot! Best regards and very nice week-end! /Ziad

Stockholm-Sweden