How to upload cost center using BDC

Hi~

I meet some problems when I try to upload cost center in BDC program for transaction VA01.

I got the right screen but after load the cost center data in the sub-screen.The program cannot go back to the header screan 'KKAU' and miss the other data in headers.It went directly to the item screen and cannot find right data for item and cannot go on.

Please help me out.I have tried a lot but still cannot work out. Thanks!!!