Increment.php

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<?php
namespace Magento\Eav\Model\Entity\Attribute\Backend;

class Increment extends \Magento\Eav\Model\Entity\Attribute\Backend\AbstractBackend
{
    public function beforeSave($object)
    {
        if (!$object->getId()) {
            $this->getAttribute()->getEntity()->setNewIncrementId($object);
        }

        return $this;
    }
}