Problem in duplicating selection screens...

Hi,

I have one selection screen defined in SE51. I want to create another one similar to that.

So, using SE38 I create an executable program called XXX. Then in SE51, I duplicated(using copy button) the former selection screen.

But when i opened it I could see only the following "screen types" displayed in enable mode..

Normal

Subscreen

Modal Dialog Box

The "selection screen" radio button is grayed and hence I cannot choose it. The radio button "Normal" is selected.

I think, bcos of this when I activate the program from where this selcection screen is invoked, I get the error message

"Generation Errors in program.

Source Code ?????????????????? Line 0

Error when generating the selection screen 1000 of report

xxx"

Am I correct ? How to resolve this problem ??

thanks