When creating the new attribute, make sure to use the arithmetic editor:

Then double-click on each attribute to insert it into the formula:

Attributecreator and use the ARITHMETIC EDITOR and add the expression.


Omg that is so stupid. I did the same but forgot to use the arithmetic Editor
Thank you!
Omg that is so stupid. I did the same but forgot to use the arithmetic Editor
Thank you!
Its an easy mistake, and something we have all done, and still do :)
Omg that is so stupid. I did the same but forgot to use the arithmetic Editor
Thank you!
If ever you needed a paperclip to pop up and say 'it looks like you're writing a formula, do you want to use the arithmetic editor?' this is it!
I thought I'd suggested an idea about warning if using math operators in the text editors but I can't find it right now.