There was a problem with floating-point numbers that were parsed incorrectly based on the locale of Windows. I think writing "0.5" instead of ".5" (for example) solves it. Also, it has been fixed in 3.1.0!
Hi Arjan. I always use format with zero. Like $SaleLineAfterDelete/LineSubTotal + $Sale/SaleNetTotal * 0.2. It also do not store values such as 365.25. I will think about updating my Mendix to newer version.
Thanks for reply. Lukas