Pagedown or scroll in BDC for ME22 transaction

Hi ALL,

Im creating new line items for the PO with the BDC for the transaction ME22.

My new line item is created depending upon the GR/IR postings. So that i have to close the line item 1 and create a new line item 20,21,22, and so on.....

The problem is that my line items after 18 are present in the next screen where i can branch only by pressing page down or scrolling..This is not getting captured in the BDC.

I tried using the index(20) but this doesnt work and is throwing an error that the field doesnt exist in the screen..

Cheers