RelationManager::getAvailableForBindingEntityTypes

protected function getAvailableForBindingEntityTypes(): array
{
	if ($this->availableEntityTypes === null)
	{
		$this->availableEntityTypes = [];
		$entityTypeIds = [
			\CCrmOwnerType::Lead => \CCrmOwnerType::Lead,
			\CCrmOwnerType::Contact => \CCrmOwnerType::Contact,
			\CCrmOwnerType::Company => \CCrmOwnerType::Company,
			\CCrmOwnerType::Deal => \CCrmOwnerType::Deal,
			\CCrmOwnerType::Order => \CCrmOwnerType::Order,
		];
		if (QuoteSettings::getCurrent()->isFactoryEnabled())
		{
			$entityTypeIds[\CCrmOwnerType::Quote] = \CCrmOwnerType::Quote;
		}
		if (InvoiceSettings::getCurrent()->isSmartInvoiceEnabled())
		{
			$entityTypeIds[\CCrmOwnerType::SmartInvoice] = \CCrmOwnerType::SmartInvoice;
		}
		foreach ($entityTypeIds as $entityTypeId)
		{
			$this->availableEntityTypes[$entityTypeId] = [
				'entityTypeId' => $entityTypeId,
				'title' => \CCrmOwnerType::GetDescription($entityTypeId),
			];
		}
		$typesMap = Container::getInstance()->getDynamicTypesMap();
		$typesMap->load([
			'isLoadStages' => false,
			'isLoadCategories' => false,
		]);
		foreach ($typesMap->getTypes() as $type)
		{
			$entityTypeId = $type->getEntityTypeId();
			$this->availableEntityTypes[$entityTypeId] = [
				'entityTypeId' => $entityTypeId,
				'title' => $type->getTitle(),
			];
		}
	}

	return $this->availableEntityTypes;
}