BDC to Update Additional Quantities on Delivery

Hello Everyone,

On VL02N delivery change, there are is a button Additional Quantities for alternate uom's.

I am trying to update this data with a BDC. Problem is that on addtional quantities its more than

6 records. To arrow down, scroll down, page down do not work.

P+ and P++ are not recognized as valid BDC codes for this t-code. Anyone know

what they might be?

Thanks,

Stephen