May I ask how are you creating your parameter? Maybe you are creating a parameter over a field that does not allow decimals.
Also, the "," won't work as it is the thousands separator. If you try 1,000,000 then the comma should work.
Hope you find this helpful.
thanks for your reply.
I don't create the parameter over a field. I create it over the drop-down menu of the data pane. So it's not bound to any data type and also I select explicitly float as data type as you can see in the screenshots.
"," comma was just a try since I'm from Germany where "," is used as the common decimal separator instead of a dot ".".
Yeah I had the same configuration when I was using my computer back at home (Chile) which was in Spanish so we used the "," too.
Regarding your problem, I really can't think of an answer if you are saying that you have it in float and is not working. Hopefully someone else will be able to answer.