Explanation: This means that you have not opted into eBay's Business Policies: http://pages.ebay.com.au/help/sell/business-policies.html OR you need to opt in again.
Answer: Ignore the warning as it does no affect the listing of the item or dataflow on a revise and if you would like to opt into business policies on eBay read the information on the link above or contact eBay customer service directly regarding this