Looks like we can't reproduce the issue or there's a problem in the test case provided.
  1. #1
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    Default Override does not work with Ext.data.Validations

    Override does not work with Ext.data.Validations


    Ext.data.Validations cannot be overridden. See the following test override:

    Code:
    Ext.define('MyApp.extend.override.Validations', {    override: 'Ext.data.Validations',
        test_function: function(config, value) {
            return config.list && Ext.Array.indexOf(config.list,value) == -1;
        }
    });

  2. #2
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    Default


    Ext.define to override a singleton is not supported. You can change the classes as it will be created right after it has been defined.
    Mitchell Simoens @SenchaMitch
    Sencha Inc, Senior Forum Manager
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