Only the data from the last four accounts are revised each year as part of the annual production campaigns (provisional, semi-final, semi-final 2, and final accounts).

In the case of a benchmark revision (approximately every five years), all sources and methods are reviewed and are subject to change. This leads to a reestimation of the base years, and all series are backcast to maintain historical trends as much as possible. Thus, in the context of a benchmark revision, all series are revised for the entire period.

All reported errors result in corrections of the disseminated data. Reported errors are corrected in the disseminated data as soon as the correct data have been validated. In this case, a warning explaining the correction and its extent is added to the dataset as well as to the publications concerned.

Changes in methodology may also occur as a result of implementing new EU Regulations. Any such change will be commented at the time of the first data release after the changes.