public function addDealerProductVersion(ChildDealerProductVersion $l)
    {
        if ($this->collDealerProductVersions === null) {
            $this->initDealerProductVersions();
            $this->collDealerProductVersionsPartial = true;
        }

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

        return $this;
    }