public function addDealerFolderVersion(ChildDealerFolderVersion $l)
    {
        if ($this->collDealerFolderVersions === null) {
            $this->initDealerFolderVersions();
            $this->collDealerFolderVersionsPartial = true;
        }

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

        return $this;
    }