Undo and Proj ExtStates...

[lexaproductions]

Hi guys,
I have Script A which changes the pitch of items and save the amount in a ProjExtState

Then Script B Shows that ProjExtState in a GUI.
It works great but the problem is if I undo Script A, then the ProjExtState is not undone which leads to Script B not showing the right value.

How can I include my ProjExtState change in the undo cycle? It's already in the undo loop in my code.