Exception-Value
If a numeric value different from "0" is set for this property and the Notify-Selchange style is set, an exception condition for the active screen is generated when the value of the List-Box control is modified.
 
Example - Define a list-box with a exception-value
screen section
...
  03 screen-1-lb-1 List-Box
     line 5.7
     column 3.1
     size 34.6 cells 
     lines 15.5 cells 
     id 1
     exception-value 201
     .