An appeal or not?

[Linknblue]

ASA Senior Slowpitch.

Situation: Courtesy runners are unlimited but can only run once per inning. We have a CR that runs for B1. Later in the inning the same CR is discovered running again for B7. Umpire knows, scorekeeper knows but defensive coach isn't saying anything.

Is this an appeal play as in a "batting out of order" question by the defense?
Is this an umpire monitored thing that falls under "preventive" umpiring?

The book says it's an "out" but doesn't say who brought it up. I can't find it in the appeals section either.

I'm think'n it's an appeal by defense but.....????

I have looked and can't find a rule reference addressing this. Can anyone enlighten me please?

Thanks,
Linknblue