Edit:
I swapped the phases to the AC charger and the Multiplus-II, so that the latter is now attached to L1.
I have also limited its power draw to 10 Amps, so overload cannot become an issue.
a VM-3P75CT is attached to the leading wires on my home distribution board, so it measures the loads on each phase, including the AC input draw of the inverter, which is attached to L2 for balancing reasons. a separated AC charger is attached to L1.
on VRM portal, the AC Loads section on the right is calculated automatically as if the inverter were drawing power from L1, which gives incorrect results in my case. is there a way to configure it according to the actual wiring?