EntityManageFacility::canAdd

protected function canAdd()
{
	$allowModes = [
		self::REGISTER_MODE_DEFAULT,
		self::REGISTER_MODE_ONLY_ADD,
		self::REGISTER_MODE_ALWAYS_ADD
	];
	if (!in_array($this->registerMode, $allowModes))
	{
		return false;
	}

	return !$this->getSelector()->hasExclusions();
}