The 3 types of supplementary declaration are:
General, filed no more than 10 days after the BAE (Release of Goods) of the simplified declaration (DS): 1 supplementary declaration (DC) per DS;
Periodic, filed no more than 10 days after the period provided for in the authorisation: 1 DC per DS;
Summary, filed no more than 10 days after the period provided for in the authorisation: several DS for one DC.