What should the PU do?

[chapmaja]

Originally Posted by Insane Blue

I tell the coaches at the plate meeting that all Pitching and Catching changes must be reported to me.

Rule 3 Section 3 Article 3
The plate umpire shall record all substitutions on the lineup card
and then announce immediately any change(s) to the opposing team. Projected substitutions are not permitted. Should there be no announcement of substitutions, a substitute has entered the game when the ball is live and:
a. a runner takes the place of a runner she has replaced.
b. a pitcher takes her place on the pitcher's plate.
c. a fielder reaches the position usually occupied by the fielder she has replaced.
d. a batter takes her place in the batter's box.
e. and, in each of the above situations, when the ball is declared live by the plate umpire.

It is not a substitution though. It is a defensive position change. A substitution by definition is when a substitute enters the game after not having previously been in the game. rule 3-3-3 does not apply to a defensive position change.