Invisible products using Webservice

[themiller12]

Hello,

I'm coming here for a problem I've seen on many topics but without any solution...

I made a software that synchronizes our inventory management software with Prestashop (1.7) via the Webservice with XML files.

The products are well imported, the stock also but only in back office. To be visible in Front Office I have to go to each product click on Save and it appears.

I saw in the database that during the save, the field "position_in_category" takes a value and that's why the product appears in Front Office.

Do you know how I can avoid this? How can I do to make a product, created with the Webservice, appear directly in front office?

Thank you very much !

Best regards.