How to change from bifacial to monofacial

[MarcusGunter]

I want to change my module from bifacial system to a monofacial system (to determine bifacial gain).

But I get a warning shown in attached image below. Why can't I use this unbalanced mppt inverter for monofacial system?

Thanks,

Marcus

screen shot of warning

[André Mermoud]

Please check that you have also suppressed the bifacial system use in your other sub-array (LED switched OFF).

[MarcusGunter]

Both sub-array systems have the bifacial system LED switched off. The same warning is present