Chapter IVa Specific measures in the case of serious deficiencies relating to external border controlF1 United Kingdom Repealed Original text. Later amendments are not shown. 19bMeasures at external borders and support by the Agency Annotations Textual amendments F1 Repealed by Regulation (EU) 2016/399 of the European Parliament and of the Council of 9 March 2016 on a Union Code on the rules governing the movement of persons across borders (Schengen Borders Code) (codification). Chapter IVa