Transaction names cannot contain a "_" ?

Hello,

on page 406 in the LR User Guide (V12.01) you can find the statement:

"Transaction names cannot contain a "_" or "@" symbol. This will cause errors to occur when
attempting to open the Analysis Cross Results graphs."

I'm using a "_" for many years as a part of transaction names in LR. I never had any problems with this notation even not for a cross result analysing.

Does anybody know, why the User Guide recommend to avoid a "_" as part of a transaction name?

Or does anybody have experiences with errors beacause of using a "_"?

Thanks!