XAML Binding Groups

Try specifying you binding group as DataGrid.ItemBindingGroup instead of DataGrid.BindingGroup:

<DataGrid.ItemBindingGroup>
   <BindingGroup>
      <BindingGroup.ValidationRules>
         <util:MinMaxParValidationRule ValidationStep="CommittedValue" />
      </BindingGroup.ValidationRules>
   </BindingGroup>
</DataGrid.ItemBindingGroup>

And in this case you actually can omit specifying the name for your binding group. It will automatically be used for all bindings in a row.

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