Predheat configuration & load forecasting

[OneTwo3D]

Hi,
when I enable preheat in predbat for a heat pump, how do I "integrate" the predicted electricity demand correctly in prebat?

I added

load_forecast:
    - predheat.heat_energy$external

But do I now need to subtract the "actual" electricity consumption of the heat pump from some other input into predbat, so that it doesn't count it twice in its forecasting?