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By default "Save" updates value only in the container data source. If you want the value to be updated to database there are couple of options, but the classic way is as follows. Get FieldGroup with getEditorFieldGroup() method of the Grid. You can set your own commit handler to to field group, with addCommitHandler(...) method. By using these facilities you can set preffered validation and how to act e.g. if database commit is not succesful.