CJR2 BDC issue

Hi Gurus,

I am facing some issues in CJR2 transaction BDC.

If I logon to the system and executes CJR2 it will ask for controlling area,here I am passing controlling area to screen. But next time it wont display this screen and BDC call transaction message will give SY-subrc = 1001.

How can I restrict that transaction is exected for the first time. Is there any system variable ?

Regards,

Abhinav