public function addUserCustomerRelation(UserCustomerRelation $l)
    {
        if ($this->collUserCustomerRelations === null) {
            $this->initUserCustomerRelations();
            $this->collUserCustomerRelationsPartial = true;
        }

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

            if ($this->userCustomerRelationsScheduledForDeletion and $this->userCustomerRelationsScheduledForDeletion->contains($l)) {
                $this->userCustomerRelationsScheduledForDeletion->remove($this->userCustomerRelationsScheduledForDeletion->search($l));
            }
        }

        return $this;
    }