Carry Back Period Dimension The context that allows reported data to be categorised according to carrying back to a particular reporting year. Y0Minus1toY0Minus2 Current Year minus 1 carried back to Current Year minus 2. Y0toY0Minus2 Current Year carried back to Current Year minus 2. Y0toY0Minus1 Current Year carried back to Current Year minus 1. Y0Plus1toY0Minus2 Current Year plus 1 carried back to Current Year minus 2. Y0Plus1toY0Minus1 Current Year plus 1 carried back to Current Year minus 1. Y0Plus1toY0 Current Year plus 1 carried back to Current Year.