What causes ?_1 to be displayed in a Plain English program?

Issue

When editing a PE program it displays "?_1"

Product Line

Andover Continuum

Environment

Plain English

Cause

An object that the program is referencing has been deleted. If multiple objects have been deleted then the integer after the ?_ will increment.

Resolution

An object that the program is referencing has been deleted. 

Recreate the missing object, enter it into the program and save the program.