ISO 19902:2020 Um under bending moments

Input

Profile Section: 406 x 20 mm

Material 420 N/mm2

Mz = 770.72 kNm

Result in SACS --> Bending Minor fbz = 345.44 N/mm2 

That is wrong! According ISO 19902:2022 Eq 13.2-12 and Eq 12.2-13/15, we have to apply Zp instead Ze.

Does anyone know the reason for the error?

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