CAllCrmQuote::SetQuoteNumber

static function SetQuoteNumber($ID)
{
	global $DB;

	$ID = intval($ID);
	if ($ID <= 0)
		return false;

	$type = COption::GetOptionString("crm", "quote_number_template", "");
	$numeratorSettings = \Bitrix\Main\Numerator\Numerator::getOneByType(REGISTRY_TYPE_CRM_QUOTE);

	$bCustomAlgorithm = false;
	$value = $ID;
	foreach(GetModuleEvents("crm", "OnBeforeCrmQuoteNumberSet", true) as $arEvent)
	{
		$tmpRes = ExecuteModuleEventEx($arEvent, Array($ID, $type));
		if ($tmpRes !== false)
		{
			$bCustomAlgorithm = true;
			$value = $tmpRes;
		}
	}

	if ($bCustomAlgorithm)
	{
		$arFields = array("QUOTE_NUMBER" => $value);
		$sUpdate = $DB->PrepareUpdate('b_crm_quote', $arFields);
		$sql = "UPDATE b_crm_quote SET $sUpdate WHERE ID = $ID";
		$res = $DB->Query($sql, true);
	}
	else
	{
		$res = false;
		if ($numeratorSettings) // if special template (numerator) is selected
		{
			for ($i = 0; $i < 10; $i++)
			{
				$value = false;
				$numerator = \Bitrix\Main\Numerator\Numerator::load($numeratorSettings['id'], ['QUOTE_ID' => $ID]);
				if ($numerator)
				{
					$value = $numerator->getNext();
				}

				if ($value !== false)
				{
					$arFields = array("QUOTE_NUMBER" => $value);
					$sUpdate = $DB->PrepareUpdate('b_crm_quote', $arFields);
					$sql = "UPDATE b_crm_quote SET $sUpdate WHERE ID = $ID";
					$res = $DB->Query($sql, true);
					if ($res)
					{
						break;
					}
				}
			}
		}
	}

	if (!$numeratorSettings || !$res) // if no special template is used or error occured
	{
		if ($type !== 'NUMBER')
		{
			$arFields = array('QUOTE_NUMBER' => $ID);
			$sUpdate = $DB->PrepareUpdate('b_crm_quote', $arFields);
			$sql = "UPDATE b_crm_quote SET $sUpdate WHERE ID = $ID";
			$res = $DB->Query($sql, true);
		}
		if (!$res && (!$numeratorSettings || $type === 'NUMBER'))    // try set max number + 1
		{
			$maxLastId = $ID;
			$maxLastIdIsSet = false;
			for ($i = 0; $i < 10; $i++)
			{
				$sql = 'SELECT MAX(CAST(QUOTE_NUMBER AS UNSIGNED)) AS LAST_NUMBER FROM b_crm_quote';
				$resLastId = $DB->Query($sql, true);
				if ($row = $resLastId->fetch())
				{
					if (strval($row['LAST_NUMBER']) <> '')
					{
						$maxLastId = $row['LAST_NUMBER'];
						$maxLastIdIsSet = true;
					}
				}
				if ($maxLastIdIsSet)
				{
					$arFields = array('~QUOTE_NUMBER' => "($maxLastId + 1)");
					$sUpdate = $DB->PrepareUpdate('b_crm_quote', $arFields);
					$sql = "UPDATE b_crm_quote SET $sUpdate WHERE ID = $ID";
					$res = $DB->Query($sql, true);
					if ($res)
					{
						COption::SetOptionString("crm", "quote_number_template", "NUMBER");
						COption::SetOptionString("crm", "quote_number_data", $maxLastId);
						if (!$numeratorSettings)
						{
							$numeratorForQuotes = \Bitrix\Main\Numerator\Numerator::create();
							$numeratorForQuotes->setConfig([
								\Bitrix\Main\Numerator\Numerator::getType() =>
									[
										'name'     => 'numerator for quote',
										'template' => '{NUMBER}',
										'type'     => 'QUOTE',
									],
								\Bitrix\Main\Numerator\Generator\SequentNumberGenerator::getType() =>
									[
										'start'              => $maxLastId,
										'isDirectNumeration' => true,
									],
							]);
							$numeratorForQuotes->save();
						}
						break;
					}
				}
			}
		}
	}

	return $res;
}