public function getProveedoresInvolucrados( $pedidoMercaderias ) {
		$provs = [];
		foreach ($pedidoMercaderias as $pm) {
			if ( !empty($pm['Mercaderia']['Proveedor']['id']) ) {
				$provs[] = $pm['Mercaderia']['Proveedor']['id'];

			}
			if ( !empty($pm['Mercaderia']['Rubro']['Proveedor']) ) {
				foreach ($pm['Mercaderia']['Rubro']['Proveedor'] as $rubro) {
					$provs[] = $rubro['id'];
				}
			}
		}
		return $provs;
	}