Add a custom field in VL01/02/03

Hi Experts,

My requirement is to add a new field in vl01/02/03 by the name 'Number Range' which will generate a number range automatically starting 1500. So whenever the billing document is created it automatically creates a new number like 1501,1502 and so on.

Is it possible to add a field in red box (preferable) or should I add it in header (goto-header)? If it is possible then how? Please suggest.

Thanks in advance

Purnand