GD&T Question

See attached image. Datums F and G are in line cylinders. The feature control frame says to check total runout of each F and G to an F-G alignment. This call out has always puzzled me. Doesn't total runout require that you check a feature to one other datum? For example, I could check F to G, or vice versa. How would you check the total runout of these datums to themselves?

Geometric Tolerancing in PCDMIS 2022 is relatively new to me, so I could be doing it wrong, but I've noticed that if I try to dimension a feature that is one of the datum's in the control frame, I get an error telling me I can't do it.

This feature is on a large part, so rotating it is not an option. Both the F and G cylinders are being scanned as circles at various depths. Cylinders are then constructed for both F and G.

So my questions are:

• Is this call out correct?
• If it is correct, how can I construct it to report correctly?
• If it's not correct, what's the best method to check this?