How menu items are named – PB Docs 2019

When you add a menu item, PowerBuilder gives it a default
name, which displays in the Name box in the Properties view. This is
the name by which you refer to a menu item in a script.

About the default menu item
names

The default name is a concatenation of the default prefix for
menus, m_, and the valid PowerBuilder characters and symbols in the
text you typed for the menu item. If there are no valid characters
or symbols in the text you typed for the menu item, PowerBuilder
creates a unique name m_n, where n is the lowest number that can be
combined with the prefix to create a unique name.

The complete menu item name (prefix and suffix) can be up to
79 characters. If the prefix and suffix exceed this size,
PowerBuilder uses only the first 79 characters without displaying a
warning message.

Duplicate menu item
names

Menu items in the Tree Menu view and WYSIWYG Menu view can
have the same names, but they cannot have the same name in the
Properties view. If you try to add a menu item using the same name
as an existing menu item, PowerBuilder displays a dialog box that
suggests a unique name for the menu item.For example, you might
already have an Options item on the Edit menu with the default name
m_options. If you add an Options item to another menu, PowerBuilder
cannot give it the name m_options.

Menu item names are locked by
default

After you add a menu item, the name that PowerBuilder assigns
to the menu item is locked.Even if you later change the text that
displays for the menu item, PowerBuilder does not rename the menu
item. This allows you to change the text that displays in a menu
without having to revise all your scripts that reference the menu
item. (Remember, you reference a menu item through the name that
PowerBuilder assigns to it.)

To rename a menu item after changing the text that displays
for it, you can unlock the name.