Revisions due to mistakes
1. Member States shall correct mistakes and transmit to the Commission (Eurostat) the revised sub-indices or sub-index weights without unjustified delay.
2. Member States shall provide the Commission (Eurostat) with information on the cause of the mistake at the latest with the transmission of the revised data.
Revisions of provisional data
1. Without prejudice to Article 27, Member States may revise provisional sub-indices and weights in the quarter following the first transmission.
2. Following a revision referred to in paragraph 1, and still without prejudice to Article 27, Member States may only revise provisional sub-indices and weights in the calendar year following the first transmission, at the time of the data transmission for the first quarter of the following year.
Other revisions
1. The timing and length of revisions other than those made pursuant to Articles 27 and 28 shall be coordinated with the Commission (Eurostat).
2. Member States shall provide the Commission (Eurostat) with estimates of the revised sub-indices and weights no later than 3 months prior to the planned implementation of the proposed revision.