ABAP Code Snippet text [FOR FIELD sel] [MODIF ID modid] [ID id].
What does it do? The COMMENT addition creates an output field on the current selection screen. You must specify a name for text that has already been used in a previous selection screen to create an output field with a SELECTION-SCREEN COMMENT statement. You cannot specify the name of a text symbol. The new output field represents the content of the global text variables already generated for the original selection screen.