Hi, did the CFA remove the portfolio duration adjustment calculation when they updated the FI section a few years ago? Was it replaced with the BPVHR formula? I am confused on when or if not at all to use BPHR formula and the formula below? Thx.

They took out the Yield Beta. Now it is just:

N_f = \frac{ModDur_T - ModDur_S}{ModDur_{CTD}} \times \frac{S}{CTD ~Price} \times Conversion ~Factor