It also can complicate the estimation of economic relationships if the historical data change.
http://www.rba.gov.au/speeches/2017/sp-dg-2017-10-26.html  4/16  27/10/2017  Uncertainty | Speeches | RBA  The annual national accounts, where the ABS ‘confronts’ the data and takes account of possible inconsistencies, as well as incorporates new information sources, is due out tomorrow, and might again change our understanding of where the economy is at currently in some key areas.