Hello.I sent a notification to the developers.Expect an answer from them here in the comments.

Hello Antal

I've investigated the issue and I believe these are but simple warnings indicating that the code generated by the software which is dedicated to providing richer information to Google's Crawlers could be widened to include more fields. These are in no way mandatory and should not prove to be penalized to your website's score. That being said, I will still notify the developers of this so that the matter can be kept under careful check by them

Thank you

Stefano

Hi Stefano G.

Yeah, that's just a warning. Google wants to create a new policy that lists products separately by price and category when searching. This feature is already working when searching.

Thank you for bringing it to the attention of the promoters.

Google search
Electric Scooter

Google: https://www.google.com/search?rlz=1C1GGRV_enHU751HU751&sxsrf=ACYBGNSRI-K7LvKU7XkmMnyycFdcAUJJdQ%3A1571691304304&ei=KBuuXeucEq73qwH84Y7wCA&q=Electric+Scooter&oq=Electric+Scooter&gs_l=psy-ab.3..0l10.180650.180650..182248...0.2..0.72.72.1......0....2j1..gws-wiz.......0i71.kfuz5vlp_gE&ved=0ahUKEwjr0I6vnq7lAhWu-yoKHfywA44Q4dUDCAs&uact=5

Product / Google

Add markup to your product pages so Google can provide detailed product information in rich Search results — including Google Images. Users can see price, availability, and review ratings right on Search results.

Link:https://developers.google.com/search/docs/data-types/product