protected function initRelation(Block $block, $timetable)
{
$externalStopPointId = $block->getStopPoint();
// all blocks are linked at least to a timetable
$this->block->setTimetable($timetable);
if (!empty($externalStopPointId)) {
// link block to this stop point
$this->block->setStopPoint($this->getStopPointReference($externalStopPointId, $timetable));
}
}
