regarding line item in bdc

Hi,

I tried bdc for transaction mfbf.

After entering all values and entering into post with correction the line item exists.

Here using counter in bdc the batches are entered.

say,

(01),

(02),

.

.

.

(15).

But after pressing page down.

The line item changes to (02). and values are get

stored in (02) of first page.

Here i am facing some difficulty.

Is there any possibility to rectify these.

If there please send me...