- Submit his feed without changing it, and then use feed rules to automatically changeproduct_state to condition
- Delete product_state completely from his feed, and then submit his feed to Merchant Center
- Manually change product_state to condition before submitting his feed to Merchant Center
- Leave product_state in his feed and also add the condition attribute
Explanation: If you spend time reformatting your product data to match the requirements in the Products Feed Specification, you may be able to create Feed Rules that transform your existing data feed instead of editing your feed each time you submit. Once you specify Feed Rules for a feed, all future uploads are processed according to those rules.
Read more here: https://support.google.com/merchants/answer/6302307