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Problem: When adding new item into EntityCollectionView raised the required validation for string fields, but for my purpose we should show it after validation on server side. Actual behavior: Here is code from metadata file: [MetadataTypeAttribute(typeof(SomeEntityMetadata))] public partial class SomeEntity { [EntityName] internal sealed class SomeEntityMetadata { private SomeEntityMetadata() { } public long Id { get; set; } [EntityName(Name = "Name", OrderIndex = 2)] public string Name { get; set; } [EntityName(Name = "Data Type", OrderIndex = 1)] public string Type { get; set; } } } And a collection of this items binded to DataGrid in xaml: <navigation:DataGridTemplateColumn CanUserReorder="True" CanUserSort="True" Header="Name" SortMemberPath="Name"> <navigation:DataGridTemplateColumn.CellTemplate> <DataTemplate> <TextBlock VerticalAlignment="Center" Text="{Binding Name}"/> </DataTemplate> </navigation:DataGridTemplateColumn.CellTemplate> <navigation:DataGridTemplateColumn.CellEditingTemplate> <DataTemplate> <TextBox Text="{Binding Name, Mode=TwoWay}" Height="Auto"/> </DataTemplate> </navigation:DataGridTemplateColumn.CellEditingTemplate> </navigation:DataGridTemplateColumn> <navigation:DataGridTemplateColumn CanUserFilter="True" CanUserSort="True" Header="Type" SortMemberPath="Type"> <navigation:DataGridTemplateColumn.CellTemplate> <DataTemplate>

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