Connector::checkConnectionExists

static function checkConnectionExists($entityPrimary, $locationPrimary, array $behaviour = array('LOCATION_LINK_TYPE' => 'ID'))
{
	$entityPrimary = Assert::expectStringNotNull($entityPrimary, '$entityPrimary');
	$locationPrimary = Assert::expectStringNotNull($locationPrimary, '$locationPrimary');

	if(!isset($behaviour['LOCATION_LINK_TYPE']))
	{
		$behaviour['LOCATION_LINK_TYPE'] = 'ID';
	}
	else
	{
		$behaviour['LOCATION_LINK_TYPE'] = Assert::expectEnumerationMember($behaviour['LOCATION_LINK_TYPE'], array('AUTO', 'ID', 'CODE'), '$behaviour[LOCATION_LINK_TYPE]');
	}

	if(!static::checkLinkUsageAny($entityPrimary)) // if there are no links at all, connection virtually exists
	{
		return true;
	}

	if($behaviour['LOCATION_LINK_TYPE'] == 'AUTO')
	{
		$field = static::getUseCodes() ? 'CODE' : 'ID';
	}
	else
	{
		$field = $behaviour['LOCATION_LINK_TYPE'];
	}

	$node = LocationTable::getList(
		array(
			'filter' => array('='.$field => $locationPrimary),
			'select' => array('ID', 'LEFT_MARGIN', 'RIGHT_MARGIN'),
			'limit' => 1
		)
	)->fetch();

	if(!intval($node['ID']))
	{
		throw new BitrixSaleLocationTreeNodeNotFoundException(false, array('INFO' => array($field => $locationPrimary)));
	}

	$result = static::getLinkStatusForMultipleNodes(array($node), $entityPrimary);

	return $result[$node['ID']] == self::LSTAT_IS_CONNECTOR || $result[$node['ID']] == self::LSTAT_BELOW_CONNECTOR;
}