If you run this formula in traditional Domino
@Text(@TextToNumber(“20,40”)*2)
You will get 80,40 back into the field
But if you run this in some XPage Code you will get
0
Why is this you might ask, well probably because javascript do not recognize comma as a decimal delimiter
So you need to change the formula to this.
@Text(@TextToNumber(@ReplaceSubstring(“20,40″,”,”,”.”))*2)
Then you will get 40,8 back. Not that when you do @Text() on the number the comma is back 😉