public function addDealerVersion(ChildDealerVersion $l)
    {
        if ($this->collDealerVersions === null) {
            $this->initDealerVersions();
            $this->collDealerVersionsPartial = true;
        }

        if (!in_array($l, $this->collDealerVersions->getArrayCopy(), true)) { // only add it if the **same** object is not already associated
            $this->doAddDealerVersion($l);
        }

        return $this;
    }