This behavior is usually observer when there isn't `id
` defined for the model or if the item, which is being cancelled, has default value of the `id` field.
In your setup there is defintion for Model.Id, however it is not obvious how the grid is bound. Read method points to some dummy action method which doesn't exists in the provided files: `.Read("Dummy", "Dummy")
The following article explains how to properly setup the Grid and how to implement controller methods in order to have editable grid working correctly: Grid Ajax Editing
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