I installed plugin Flexible Product Fields PRO from: https://www.wpdesk.pl/sklep/flexible-product-fields-pro-woocommerce/
This plugin add extra fields to the product. Example: https://etykietynaksiazki.pl/product/etykieta-foliowa-40-mm-x-15-mm/
Unfortunatelly extra fields are not valitaded even when I sign them to be valitaded.
I wrote to plugin designers and they send me screen:
https://wpdesk.me/ls/bk4ifuApxt.png
There are a problem in Classico Template.
I change template for a while on https://woocommerce.com/storefront/ and there were everything ok.
