CHAPTER VI ENTRY PRICE SYSTEM AND IMPORT DUTIES

Article 38 Standard import values
1. For each product and for the periods of application set out in Part A of Annex VII to Delegated Regulation (EU) 2017/891, the Commission shall fix each working day and for each origin, a standard import value equal to the weighted average of the representative prices referred to in Article 74 of that Regulation, less a standard amount of EUR 5/100 kg and the ad valorem customs duties.
2. Where a standard import value is established for the products and for the periods of application set out in Part A of Annex VII to Delegated Regulation (EU) 2017/891, in accordance with Articles 74 and 75 of that Regulation and this Article, the unit price as referred to in Article 142 of Commission Implementing Regulation (EU) 2015/2447 shall not apply. It shall be replaced by the standard import value referred to in paragraph 1.
Commission Implementing Regulation (EU) 2015/2447 of 24 November 2015 laying down detailed rules for implementing certain provisions of Regulation (EU) No 952/2013 of the European Parliament and of the Council laying down the Union Customs Code (OJ L 343, 29.12.2015, p. 558).
3. Where no standard import value is in force for a product of a given origin, the weighted average of standard import values in force for that product shall apply.
4. During the periods of application set out in Part A of Annex VII to Delegated Regulation (EU) 2017/891, the standard import values shall remain applicable until they are changed. They shall cease to apply, however, where no average representative price has been notified to the Commission for two consecutive weeks.
Where, pursuant to the first subparagraph, no standard import value applies to a given product, the standard import value applicable to that product shall be equal to the last average standard import value.
5. By way of derogation from paragraph 1, where it has not been possible to calculate a standard import value, no standard import value shall be applicable from the first day of the periods of application set out in Part A of Annex VII to Delegated Regulation (EU) 2017/891.
6. The exchange rate applicable to the standard import value shall be the rate most recently published by the European Central Bank prior to the last day of the period for which prices are transmitted.
7. The standard import values expressed in euro shall be published by the Commission via TARIC.
http://ec.europa.eu/taxation_customs/customs/customs_duties/tariff_aspects/customs_tariff/index_en.htm