You can only use "statable fields" in that gadget. Essentially, to be statable, you have to be able to point at a list of possible values for it, and you can't do that with a numeric field.
There are some add-ons which can make fields statable, but in my experience, they tend to fail with large data sets.
Thanks for your answer. Do you know what add-on would do what we need?
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