gaouizer

As on can see in the following pictures, this bug is present in pure Modelica, but absent in Dynawo (using pre-assembled Modelica models) Modelica results (with bug)  Dynawo results...

how about this: `````` from [poawsybl-core iidm_V1_13.xsd](https://github.com/powsybl/powsybl-core/blob/cdee51a924668e5c19eeed53abd87d6b3b23d647/iidm/iidm-serde/src/main/resources/xsd/iidm_V1_13.xsd#L51)?

Shall we consider adding or editing one or several NRTs to illustrate this dev ?