Forum Post: Allowable stress in expansion case showing as zero

I did analysis of a piping system as per ASME 31.3 and results are OK.

I have a requirement to qualify same system as per EN13480 also.

I changed code in "general model options" and run the system.

(Material are as per ASME and thickness are as per ASME schedule but NS as per EN standard. These are all OK)

Now when I run the system, the allowable stress in expansion case showing as zero. So I could not evaluate the system.

Request your advice to solve the problem.