Hey Alex,
thank you for your answer.
attached I send the source code of the plugin.
It is included in the component package of j2store pro.
The plugin would solve the issue with duplicate content.
Please see here for more information:
www.j2store.org/component/kunena/2-gener...te-product-urls.html
It seems, that this plugin adds a canonical tag for pages with the same content having the correct tag.
j2canonical.zip
It seems, that the shopping component is also working without that plugin. But I am bot sure, if I need this plugin to prevent google indexing issues.
Best
Rene