The substitutionGroup of the OrganizationUnit element defined in the netex_framework\netex_genericFramework\netex_organisationversion.xsd file is DataManagedObject, while it should be OrganizationPart.
See fragments from a file:
The OrganizationalUnit comes from the OrganizationPart, but we cannot specify an object of this type in a parts in an Organization due to an incorrect substitution. All other objects from the OrganizationPart can be specified (eg.: ControlCentre, Department, etc.)
The substitutionGroup of the OrganizationUnit element defined in the netex_framework\netex_genericFramework\netex_organisationversion.xsd file is DataManagedObject, while it should be OrganizationPart. See fragments from a file: