Hello,
1 - For HikaShop questions you MUST use the HikaShop section of the forum.
You're here in the HikaMarket section of the forum where I provide support for HikaMarket and HikaMarket only !
If you take a look at my previous message, you will read easily :
Please note that the question is related to HikaShop and not HikaMarket.
and more precisely :
For HikaShop related stuff, you have to use the HikaSection section of the forum.
2 - If you take a look at previous message, you will also see that I re-post the message that Nicolas send you some time ago.
Message which already contains the solution.
Once again, I do have the feeling that I write and I'm not read.
If you then use hikashop_contentLink to generate your URL, it will automatically pickup the canonical URL to use that link if the "force canonical URL on listing" option of HikaShop is activated. But that won't help with duplicate content SEO errors. Just having a canonical URL in the product is enough. It will just make the module more consistent with how HikaShop works.
...
And if you want to know more about that, I invite you to create a new thread in the HikaShop section for the forum since you're question is related to HikaShop and not HikaMarket.