I do not understand very well.

Related to the subject, I understand that now Caesar will not apply anymore the 0.75 multiplier for B31.3 2020 Edition. The Caesar help state that "When B31J is enabled (through Apply B31J SIFs and Flexibilities), the software ignores this configuration option."

However, there is something in B31.3 2020 S302.6.3 that makes me think that it still justified the 0.75 multiplier. This para state that the in-plane bending moment in the example is calculated by multiplying 0.75 times i inplane determined from ASME B31J, Table 1-1.
So it seems that the B31.3 itself believe that para 320.2 actually indicate the use of the 0.75 multiplier.