Commission Regulation (EC) No 1028/2007 of 5 September 2007 initiating an investigation concerning the possible circumvention of anti-dumping measures imposed by Council Regulation (EC) No 1472/2006 on imports of certain footwear with uppers of leather originating in the People's Republic of China by imports of certain footwear with uppers of leather consigned from Macao SAR, whether declared as originating in Macao SAR or not, and making such imports subject to registration