You have to make sure you have the correct distribution system setup in the project (415/230V) and also the correct correct distribution system assigned to the panels and the receptacles.
When creating the distribution systems, you have to make sure that the voltage values match for the single phase and the individual phases of the 3 phase system.
Main Panel would have a 415/230V three phase assinged to it, the single phase pnael would have a 230V single phase distribution system and the receptacle would still be 230V single phase distribution system.
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