How do I exclude duplicate products existing in multiple stores?

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If you have multiple stores, you may have some items that exist in multiple stores with the same product ID. Google Shopping disallows duplicate listings; in other words, they do not allow you to submit the same product more than once.

The duplicate exclusion feature allows you to set a priority for each store. Products existing in multiple stores will only be submitted in the store with highest priority. This ensures that your feeds only submit each product once.

To use this feature, simply assign a priority to each of your data feeds from the Advanced Settings → Duplicate Priority page.