src/cfnlint/rules/resources/properties/ListDuplicates.py [38:74]:
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                if value_hash in list_items:
                    if not scenario:
                        message = 'List has a duplicate value at {0}'
                        matches.append(
                            RuleMatch(path + [index], message.format('/'.join(map(str, path + [index])))))
                    else:
                        scenario_text = ' and '.join(
                            ['condition "%s" is %s' % (k, v) for (k, v) in scenario.items()])
                        message = 'List has a duplicate value at {0} when {1}'
                        matches.append(RuleMatch(path, message.format(
                            '/'.join(map(str, path)), scenario_text)))

                list_items.append(value_hash)

        return matches

    def check_duplicates(self, values, path, cfn):
        """ Check for duplicates """
        matches = []

        if isinstance(values, list):
            matches.extend(self._check_duplicates(values, path))
        elif isinstance(values, dict):
            props = cfn.get_object_without_conditions(values)
            for prop in props:
                matches.extend(self._check_duplicates(
                    prop.get('Object'), path, prop.get('Scenario')))

        return matches

    def check(self, cfn, properties, value_specs, path):
        """Check itself"""
        matches = list()
        for p_value, p_path in properties.items_safe(path[:]):
            for prop in p_value:
                if prop in value_specs:
                    property_type = value_specs.get(prop).get('Type')
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src/cfnlint/rules/resources/properties/ListDuplicatesAllowed.py [38:74]:
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                if value_hash in list_items:
                    if not scenario:
                        message = 'List has a duplicate value at {0}'
                        matches.append(
                            RuleMatch(path + [index], message.format('/'.join(map(str, path + [index])))))
                    else:
                        scenario_text = ' and '.join(
                            ['condition "%s" is %s' % (k, v) for (k, v) in scenario.items()])
                        message = 'List has a duplicate value at {0} when {1}'
                        matches.append(RuleMatch(path, message.format(
                            '/'.join(map(str, path)), scenario_text)))

                list_items.append(value_hash)

        return matches

    def check_duplicates(self, values, path, cfn):
        """ Check for duplicates """
        matches = []

        if isinstance(values, list):
            matches.extend(self._check_duplicates(values, path))
        elif isinstance(values, dict):
            props = cfn.get_object_without_conditions(values)
            for prop in props:
                matches.extend(self._check_duplicates(
                    prop.get('Object'), path, prop.get('Scenario')))

        return matches

    def check(self, cfn, properties, value_specs, path):
        """Check itself"""
        matches = list()
        for p_value, p_path in properties.items_safe(path[:]):
            for prop in p_value:
                if prop in value_specs:
                    property_type = value_specs.get(prop).get('Type')
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