Could somebody explain to me why PVelite doesn't calculate longitudinal bending moments M1 and M2 for non symmetrical saddle arrangement acc. to 4.15.3.2(b)?

In PVelite calculation report I can find only longitudinal bending moments which are calculated acc. to 4.15.3.2(a) for symmetrical saddle arrangement, even saddles are non symmetrical arranged.

Thanks in advance.
Zoran