public function addDealerShedulesVersion(ChildDealerShedulesVersion $l)
    {
        if ($this->collDealerShedulesVersions === null) {
            $this->initDealerShedulesVersions();
            $this->collDealerShedulesVersionsPartial = true;
        }

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

        return $this;
    }