Hi Rob,
I reviewed the issues. You can try using it in the startup file
PRINT 'OPTION'("Utility","3999=My Custom Tool")
Manual: https://manual.pvxplus.com/PXPLUS/mnemonics/option.htm

Hi Rob,
The menu bar displayed in the PxPlus Command Line window (Program / Utilities / Edit / Debug / Help) is defined internally. Unfortunately, these programs are not accessible or modifiable by end users, so there's no supported way to read the menu definition or add items to those built-in sub-menus.

Hi James,

Could you confirm which PxPlus version and ODBC driver version you are using?

I checked the documentation, and this error may occur when running PxPlus versions prior to 4.23 or ODBC driver versions prior to 3.22.