Screen 100 - Selection screen

Screen No 1000 in not visible in copied programme

Defines a screen that is automatically created during the generation of an executable ABAP program. Selection screens contain screen elements for the SELECTION-SCREEN and the PARAMETERS statements of this program. If the program has a logical database connected to it, the selection screen contains screen elements that allow you to enter database selection criteria. The system sets this attribute automatically.

Open the program in SE80.
Right click on the program name and select OTHER FUNCTIONS--> Rebuild Object List.
The screen which are automatically created through SELECTION-SCREEN will not be created when you copy the whole program. Only upon doing the above step you will get it.