Usually having ONLY GRP pipe(following iso 14692 spec), inside load case editor you have to put values inside "OCC Load factors":

Hydrotest case: 1.33
OPE cases: 1.24
SUS case: 1
OCC cases: 1.33

(note: in the caesar main windows i set "system Design Factor" = 0.67)

Now the problem:

If in this "GRP-only" system you add a metal pipe (following B31.3 spec), in load case editor some "OCC load factors" will become grey, without value inside, no more editable.

SO:

adding a metal pipe and spec B31.3, DO CAESAR CALCULATE GRP PIPE CORRECTLY OR DO THE MISSING VALUES FALSE THE RESULTS?

thank you