After defining the Shape Definition in Bar Factory Setting in Concrete Positioning, it gets locked for further browsing.
If you see in the picture the Browse option of Shape Definition is deactivated in bar Factory Settings Dialog,
To unlock this Browse button, the following Key-in command to be run which will clear the previous bar definition and will allow to user to browse.
mdl command PCX_TEST
In CE Edition its
Proconcrete delete Barmarks
If you have refreshed or changed the code please use
proconcrete manage refreshcodes
This should will update your code.