Accounts shall be in one of the following status: open, blocked, excluded or closed.

No processes may be initiated from blocked accounts, except for the processes specified in Articles 25, 31, 35, 67, 77, 81 and 82.

No processes may be initiated from closed accounts. A closed account may not be re-opened, and may not acquire units.

Upon exclusion of an installation from the Union scheme pursuant to Article 27 of Directive 2003/87/EC, the national administrator shall set the corresponding operator holding account to excluded status for the duration of the exclusion.

Upon notification from the competent authority that an aircraft operator's flights are no longer included in the Union scheme in accordance with Annex I to Directive 2003/87/EC in a given year, the national administrator shall set the corresponding aircraft operator holding account to excluded status, after giving prior notice to the aircraft operator concerned and until notification from the competent authority that an aircraft operator's flights are again included in the Union scheme.

No processes may be initiated from excluded accounts, except for the processes specified in Articles 25 and 68 and the processes specified in Articles 35 and 67 corresponding to the period where the account status was not set to excluded.