Google Shopping Product Category

Hi!

Does anyone know why Google assigns their product categories based on Product Type when there’s a metafield called mm-google-shopping.google_product_category? What is the purpose of this metafield?

Thanks!

Allowing you to manually change the values based on: https://www.google.com/basepages/producttype/taxonomy-with-ids.en-US.txt

Google will not always be able to automatically assign the values correctly.