The stress limit pairs defined for the current material are displayed.  The desired pair can be selected.

Stress limit pairs are material parameters which must be defined in the material table (currently no default values for standard materials implemented). The capture "Stress limits" in the window for editing material parameters, the user can  define up to 6 stress limit pairs, which represent the lower and upper stress limits for a certain proof check.

Default  (no entry or 0):  The first stress limit pair is selected