False negative in ref system voltage validation

[sebastian-peter]

With vn_simona test grid:

11:55:08.795 WARN  e.i.s.s.setup.SimonaStandaloneSetup$ - The configured RefSystem for subGrid 14 differs in its nominal voltage (20.0 kV) from the gridspredominant voltage level nominal voltage (20.0 kV). If this is by intention and still valid, this warning can be just ignored!
11:55:08.814 WARN  e.i.s.s.setup.SimonaStandaloneSetup$ - The configured RefSystem for subGrid 11 differs in its nominal voltage (20.0 kV) from the gridspredominant voltage level nominal voltage (20.0 kV). If this is by intention and still valid, this warning can be just ignored!
11:55:08.820 WARN  e.i.s.s.setup.SimonaStandaloneSetup$ - The configured RefSystem for subGrid 126 differs in its nominal voltage (0.4 kV) from the gridspredominant voltage level nominal voltage (0.4 kV). If this is by intention and still valid, this warning can be just ignored!
11:55:08.823 WARN  e.i.s.s.setup.SimonaStandaloneSetup$ - The configured RefSystem for subGrid 12 differs in its nominal voltage (20.0 kV) from the gridspredominant voltage level nominal voltage (20.0 kV). If this is by intention and still valid, this warning can be just ignored!
11:55:08.825 WARN  e.i.s.s.setup.SimonaStandaloneSetup$ - The configured RefSystem for subGrid 13 differs in its nominal voltage (20.0 kV) from the gridspredominant voltage level nominal voltage (20.0 kV). If this is by intention and still valid, this warning can be just ignored!
11:55:08.827 WARN  e.i.s.s.setup.SimonaStandaloneSetup$ - The configured RefSystem for subGrid 1000 differs in its nominal voltage (380.0 kV) from the gridspredominant voltage level nominal voltage (380.0 kV). If this is by intention and still valid, this warning can be just ignored!
11:55:08.834 WARN  e.i.s.s.setup.SimonaStandaloneSetup$ - The configured RefSystem for subGrid 136 differs in its nominal voltage (0.4 kV) from the gridspredominant voltage level nominal voltage (0.4 kV). If this is by intention and still valid, this warning can be just ignored!
11:55:08.850 WARN  e.i.s.s.setup.SimonaStandaloneSetup$ - The configured RefSystem for subGrid 146 differs in its nominal voltage (0.4 kV) from the gridspredominant voltage level nominal voltage (0.4 kV). If this is by intention and still valid, this warning can be just ignored!
11:55:08.856 WARN  e.i.s.s.setup.SimonaStandaloneSetup$ - The configured RefSystem for subGrid 116 differs in its nominal voltage (0.4 kV) from the gridspredominant voltage level nominal voltage (0.4 kV). If this is by intention and still valid, this warning can be just ignored!
11:55:08.859 WARN  e.i.s.s.setup.SimonaStandaloneSetup$ - The configured RefSystem for subGrid 1 differs in its nominal voltage (110.0 kV) from the gridspredominant voltage level nominal voltage (110.0 kV). If this is by intention and still valid, this warning can be just ignored!