Like in previous off-line versions of AccountRight, after entering a number in the backorder field and hitting "enter" please have the curser return to the start of the next line (and highlight qty).
Currently it drops down to the backorder field on the line below then you have to select Bill Qty with mouse or arrow left twice.
Pic after typing qty in backorder
Pic after hitting enter key
This also happens on invoices and would be great if it was fixed.