If you receive a message from Google that your products are duplicates, the likely cause is that you are submitting variants with the same title and URL. To correct this, you should include the unique qualities of your variants in your product title.
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If Google says "missing product type" or "missing product_type attribute", then you'll need to add a "product_type" field to your feed. Go into your feed, click "adjust mapping", add a field named "product_type" and map it to the product's main category. ...
How do I add Google Product Categories to my feed?
It's a 3 step process:
1.) Add an extra product field named "google product category" (or similar)
2.) Add a field to your Google Shopping feed named "google_product_category" and map it to the ext...
This issue is related to your products requiring correct identification and is not a fault in Feed Manager.
To change your set up to accomodate these changes please go into Feed Manager, open the Google Base feed, then click the Adjust Mapping button, ...