That doesn’t make sense, you would get a error related to trying to coerce a float to a string:
I would expect something like this to be thrown:
WARN: Error invoking script.Traceback (most recent call last):
File "<function:updateData>", line 10, in updateData
TypeError: can't convert 0 to java.lang.String
I would just delete the script entirely and type @PUESTO_2_INI.Amps + PUESTO_2_FIN.Amps@
into the field.
Just a small nitpick, why are you calling your value “Amps” if it is a measure of power usage, presumably kWh?