If we change case of entity name and try to upgrade DB shema this exception will be thrown:

System.ArgumentException: An item with the same key has already been added. at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource) at System.Collections.Generic.Dictionary2.Insert(TKey key, TValue value, Boolean add) at System.Collections.Generic.Dictionary2.Add(TKey key, TValue value) at Xtensive.Sql.Model.NodeCollection1.Add(TNode item) at Xtensive.Sql.Model.PairedNodeCollection2.Add(TNode item) at Xtensive.Sql.Model.Table.ChangeSchema(Schema value) at Xtensive.Sql.Model.SchemaNode.set_Schema(Schema value) at Xtensive.Sql.Model.DataTable..ctor(Schema schema, String name) at Xtensive.Sql.Model.Table..ctor(Schema schema, String name) at Xtensive.Storage.Providers.Sql.SqlActionTranslator.CreateTable(TableInfo tableInfo) at Xtensive.Storage.Providers.Sql.SqlActionTranslator.VisitCreateTableAction(CreateNodeAction action) at Xtensive.Storage.Providers.Sql.SqlActionTranslator.VisitCreateAction(CreateNodeAction action) at Xtensive.Storage.Providers.Sql.SqlActionTranslator.VisitAction(NodeAction action) at Xtensive.Storage.Providers.Sql.SqlActionTranslator.VisitAction(NodeAction action) at Xtensive.Storage.Providers.Sql.SqlActionTranslator.VisitAction(NodeAction action) at Xtensive.Storage.Providers.Sql.SqlActionTranslator.VisitAction(NodeAction action) at Xtensive.Storage.Providers.Sql.SqlActionTranslator.VisitAction(NodeAction action) at Xtensive.Storage.Providers.Sql.SqlActionTranslator.Translate() at Xtensive.Storage.Providers.Sql.SchemaUpgradeHandler.UpgradeSchema(ActionSequence upgradeActions, StorageInfo sourceSchema, StorageInfo targetSchema) at Xtensive.Orm.Building.Builders.DomainBuilder.SynchronizeSchema(SchemaUpgradeMode schemaUpgradeMode) at Xtensive.Orm.Building.Builders.DomainBuilder.BuildDomain(DomainConfiguration configuration, DomainBuilderConfiguration builderConfiguration) at Xtensive.Orm.Upgrade.UpgradingDomainBuilder.BuildStageDomain(UpgradeStage stage) at Xtensive.Orm.Upgrade.UpgradingDomainBuilder.Build(DomainConfiguration configuration) at Xtensive.Orm.Domain.Build(DomainConfiguration configuration) at DataModel.DataDomain..ctor(DomainUpgradeMode upgradeMode, Boolean inMemory, String connectionString)