Custom Hidden Selections after Upgrade to A9.3 or Above
The menus that contain Hidden Selections (ZHIDDEN, ZHIDDEN002, and ZHIDDEN003) are replaced during an upgrade. If you have custom Hidden Selections in these menus you will need to re-enter them after the upgrade. Note that if you run the menu comparison in proof mode (as per the A9.3 Upgrade Guide recommendations), you should see the ZHIDDEN, HIDDEN002, and ZHIDDEN003 menus on the report if they are different (between your old production environment and your A9.3 environment), and then you can use that report to make the changes in your A9.3 environment.
In addition, keep in mind that your custom hidden selection cls will also need to be moved to your A9.3 JDFOBJ or your A9.3 custom object library in your A9.3 environment.