"This is what the creators of the software instruct us to do. These folks also serve (or at least used to serve) as members of the committee for the ASME piping code. I strongly recommend that we adhere to their instruction, as I'm sure they're very certain on the intent on the application of this piping code in their software."

It is in their documentation here:
https://docs.hexagonppm.com/reader/O04dxcwMfibZIK1cyksZvQ/y8mPw1Z_BdQYjgU1fqz93g

And per their instruction here:

https://coade.typepad.com/coadeinsider/2010/06/caesar-ii-webinar-load-case-editor.html

As well as a document floating around named "895-387-LoadCases.pdf," that you can find on the forums and via google, which seems it's from COADE, but I can't authenticate that.