Variation/AbstractVariation.php
public function valid()
    {
        foreach ($this->getNested() as $variation) {
            if ($variation->isValid()) {
                return true;
            }
        }

        return $this->isValid();
    }
public function valid()
    {
        foreach ($this->getNested() as $variation) {
            if ($variation->isValid()) {
                return true;
            }
        }

        return $this->isValid();
    }
{@inheritdoc}