Hello Riccardo,
Thanks for your reply.
I did install Wooprice Calculator before WooCommerce. I uninstalled Wooprice and reinstalled but nothing changed. I updated the plugin to version 1.2.3 but still no result.
I uninstalled Woocommerce and Wooprice and installed Woocommerce first and after that Wooprice again. But no result.
It has no effect.
Best regards,
Tom