The warning informs that the estimated method for fire resistance is not applicable for bending. It can only be used for compression and slenderness below 35 as stated in DTU P 92-701.

The exact method for bending is not available in Robot yet as far as I know you the freeware named CIMFEU for this kind of calculation is available from:
CIMbéton
7, Place de la Défense
92 974 Paris-La-Défense Cedex
+33 (0) 1 55 23 01 12

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Artur Kosakowski