Required SLS combinations

[Anonymous]

Had a note during plate and shell reinforcement calculations: 

CALCULATION STATUS

"Required types are not ascribed to SLS combinations. Calculations may be incorrect."

I accepted this and the calculation results were  complete. There was one SLS combination and one ULS combination calculated.

What is the reason for the note "Required types are not ascribed to SLS combinations" and can I fix it somehow? Haven't got this note before during plate and shell reinforcement calculations.

[Rafal.Gaweda]

Take a look here:

http://forums.autodesk.com/t5/Autodesk-Robot-Structural/SLS-combination/m-p/3316923/highlight/true#M...