Google Merchant Center Feed Change

Google has announced a changes to In Stock and Available for Order.   All items that can be purchased and delivered in a   timely manner can now use the ‘in stock’ value.  As of September 30, “available for order” will no longer be accepted.
To quote Google,

As we announced on June 19 2014, we’re adding new attributes,   changing the values for the ‘availability’ attribute, and introducing new   length limits for most of our attributes. You can read the full   announcement and learn more about this year’s feed specification update by   visiting https://support.google.com/merchants/answer/3097504.
We are simplifying the ‘availability’ attribute by merging ‘in stock’ with   ‘available for order’. All items that can be purchased and delivered in a   timely manner can now use the ‘in stock’ value. If you are currently using   ‘available for order’ in any of your items, please replace it with ‘in stock’ before September 30 2014.
You can read the full requirements for this   attribute by visiting   https://support.google.com/merchants/answer/188494#availability

So check your feed and make sure you have correct values in the