Invoice::getFields

public function getFields()
{
	if($this->fields === null)
	{
		parent::getFields();

		Loc::loadMessages(__FILE__);
		$this->fields['USER_DESCRIPTION']['TITLE'] = Loc::getMessage('CRM_DOCGEN_DATAPROVIDER_USER_DESCRIPTION_TITLE');

		$this->fields['DEAL'] = [
			'PROVIDER' => Deal::class,
			'VALUE' => 'UF_DEAL_ID',
			'TITLE' => GetMessage('CRM_DOCGEN_DATAPROVIDER_INVOICE_DEAL_TITLE'),
			'OPTIONS' => [
				'isLightMode' => true,
			],
		];

		$this->fields['PRICE']['TYPE'] = Money::class;
		$this->fields['PRICE']['FORMAT'] = ['CURRENCY_ID' => $this->getCurrencyId()];
	}

	return $this->fields;
}