How to track a change in a product property in 1C-Bitrix?

Question

1C-Bitrix

The product has a property (checkbox), and it is not clear how it works. I remove the checkbox, save it, but it does not go away.
There is nothing in the init.php file.
How can you track. what event and function change it before saving?

Answer 1

Found. In the init.php file, you need to add the following function to the "OnIBlockElementSetPropertyValuesEx" event:

\Bitrix\Main\EventManager::getInstance()->addEventHandler('iblock', 'OnIBlockElementSetPropertyValuesEx',"OnIBlockElementSetPropertyValuesExHandler");

function OnIBlockElementSetPropertyValuesExHandler($ELEMENT_ID, $IBLOCK_ID, $PROPERTY_VALUES, $propertyList, $arDBProps) {
  define("LOG_FILENAME", $_SERVER["DOCUMENT_ROOT"] . "/log-prop.txt");
    AddMessage2Log(print_r($PROPERTY_VALUES, 1));
}

After that, the property code, value, and below the links to the files and lines that were involved will appear in the logs.