composite construction-switching portfolios investment, original, change

brain_wash_your

curriculum vol 6 page 304 says in the blue box that when a portfolio is to be switched to a new composite then its historical performance must remain with appropriate composite...
then 4 lines below in the text it says historical performance must remain with original composite...

which is it?

if i change composites due to change of investment strategy then historical performance of portfolio will remain with original composite which is not applicable anymore??

thanks in advance...