Changes made by 77/186/EEC: Council Decision of 14 February 1977 on the exporting of crude oil and petroleum products from one Member State to another in the event of supply difficulties
EU Decision 1977/186
No changes made by 77/186/EEC: Council Decision of 14 February 1977 on the exporting of crude oil and petroleum products from one Member State to another in the event of supply difficulties are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.