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Also, one problem I have run into, is that first of all, the extra related products save just fine. However, if you then edit the product’s other attributes, such as price/pictures and save it, the extra related products are then lost.
To get around this I opened Observer.php and changed the line:
I had a bunch of message on the product view page due to disabled “short open tag” in the PHP settings. I enabled it and now i can see the item Accessories in the list of item. (i had to remove the cache & session files to).
Magento just approved me a new extension that I created, it allows to create multiple product relations and assign them to attribute sets.
Its quite cheap and fully compatible with any magento version, here is the link: