Google product markup

Hi,

HikaShop does have these markup (microdata) on the product pages by default.
Now customization could have screwed them up or maybe you're using a view file from a really old version of HikaShop where these markups where not present in your customization.
It's hard to say exactly what is the problem and what can be done without a link to a product page so that we can look at its HTML.
Could you provide a link ?
If you want to provide it privately, you can use our contact form and include a link to this thread too:
www.hikashop.com/support/contact-us.html

Hello,

First, note that you can use this tool to test the structured data of your pages:
search.google.com/structured-data/testing-tool
By doing so on your URL, I find indeed the warning messages of your screenshot.
Note that these are warnings, not errors.
Basically, these are things that would arrange Google if you could provide them but are not mandatory.
For example, for priceValidUntil this can only be provided if you know when you are going to change your prices.
So you can ignore them.
Regarding the image warning, we changed the code in show_block_img in HikaShop 4.0.3 to avoid this warning. So when you update, you will not have it anymore.
Regarding the SKU, it's the 'product code'. If you enable the display of the product code on the product page in the HikaShop configuration, you will no longer have this warning. It actually depends on whether you want to publish the product code or not ...