public function getConcepto(PropelPDO $con = null) { if ($this->aConcepto === null && $this->fk_concepto_id !== null) { $c = new Criteria(ConceptoPeer::DATABASE_NAME); $c->add(ConceptoPeer::ID, $this->fk_concepto_id); $this->aConcepto = ConceptoPeer::doSelectOne($c, $con); } return $this->aConcepto; }