(17)Determination of the place where taxable transactions are carried out may engender conflicts concerning jurisdiction as between Member States, in particular as regards the supply of goods for assembly or the supply of services. Although the place where a supply of services is carried out should in principle be fixed as the place where the supplier has established his place of business, it should be defined as being in the Member State of the customer, in particular in the case of certain services supplied between taxable persons where the cost of the services is included in the price of the goods.