Базовый атрибут "<var>Attribute</var>" с use = "required" не имеет соответствующего производного атрибута при переопределении группы атрибутов "<var>X</var>".

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The base attribute '<var>Attribute</var>' whose use = 'required' does not have a corresponding derived attribute while redefining attribute group '<var>X</var>'.

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