How, before loading or updating goods from 1s to Bitrix, to prohibit unloading goods with a price of 0, or replace zero with empty?

Question

1C-Bitrix

It is necessary not to upload prices equal to zero, or change them to empty
How to do this when exchanging with 1C?
I don't know where to start dripping.

Answer 1

Add an event check OnBeforeIBlockElementUpdateor OnBeforeProductAdd. In the handler, to determine that the event was called during the exchange with 1C, you can use the following crutch condition:

if (isset($_GET['type'], $_GET['mode']) && $_GET['type'] === 'catalog' && $_GET['mode'] === 'import') {
    // ...
}

Here is more details.

Answer 2

In the code)
look for a request that generates data for unloading. Correct it.