VE Configure: purpose of the external current sensor setting

The MultiPlus-II has support for an external AC current sensor (CT clamp). By removing a wire bridge on the terminal, the external sensor is supposed to replace the internal sensor on AC-in. But why do you also need to enable the “External current sensor connected” checkbox in the general settings of VE Configure. What is the effect of this setting?

I would like to know the answer to this one as well…

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