Residual Income discrpency

Has anyone done Residual Income from Scweser. It seems like how it caluclates terminal value in residual income valuation id different from how it is calculated in CFA cirriculum.

For instance if RI is forecasted for next five years then in shweser it calculates terminal value at the end of year 4 whereas in CFA cirriculum it calculates the terminal value at the end of year 5.