CCrmFieldMulti::DeleteByElement

public function DeleteByElement($entityId, $elementId)
{
	$err_mess = (self::err_mess()).'
Function: DeleteByElement
Line: ';

	$elementId = intval($elementId);

	if ($entityId == '' || $elementId == 0)
	{
		return false;
	}

	$idsToRemove = [];
	$dbResult = $this->cdb->Query(
		"SELECT ID FROM b_crm_field_multi WHERE ENTITY_ID='" . $this->cdb->ForSql($entityId) . "' AND ELEMENT_ID=" . $elementId,
		false,
		$err_mess . __LINE__
	);
	while ($row = $dbResult->Fetch())
	{
		$idsToRemove[] = (int)$row['ID'];
	}

	$res = $this->cdb->Query(
		"DELETE FROM b_crm_field_multi "
		. "WHERE ENTITY_ID = '" . $this->cdb->ForSql($entityId) . "' AND ELEMENT_ID = '" . $elementId . "'",
		false,
		$err_mess . __LINE__
	);

	$entityTypeId = CCrmOwnerType::ResolveID($entityId);

	//region Register volatile duplicate criterion fields
	DuplicateCommunicationCriterion::processMultifieldsChange($entityTypeId, $elementId);
	DuplicateVolatileCriterion::register($entityTypeId, $elementId, [FieldCategory::MULTI]);
	//endregion Register volatile duplicate criterion fields

	if (!empty($idsToRemove))
	{
		foreach ($idsToRemove as $id)
		{
			FieldMultiPhoneCountryTable::deleteByByMultiFieldId($id);
		}
	}

	return $res;
}