Data specification update for certification attribute - Google Merchant Center News
From 8 April energy efficiency class attributes will be replaced for all goods sold in EU countries by the more general certification [certification] attribute.
This will ensure compliance for products requiring graphical energy efficiency class labels in the EU (covering both rescaled and non-rescaled labels).
The energy efficiency class attributes will remain available for products sold in Norway, Switzerland and the UK, where entry of products in the EU EPREL registry is not required but showing the energy efficiency class is required. - Google.
