PLEASE MODIFY THE PREVIEW PANEL IN BILLINGS : I'D REALLY LIKE TO CHANGE THE ESTIMATE OR INVOICE # IN THE PREVIEW PANEL WHEN I HAVE TO MAKE A MODIFICATION AFTER REALISING I DID A MISTAKE IN THE ESTIMEATE/INVOICE. AT PRESENT I NEED TO CANCEL AND GO TO THE PREFERENCE PANEL, CHANGE THE NUMBERING VALUE AND START MODIFY OR START AGAIN. AFTER THAT GOING AGAIN TO THE PREFERENCE PANEL AND PUT THE CORRECT # VALUE. WHY NOT SUGGEST THE CORRECT # IN THE PREVIEW PANEL WITH THE ABILITY TO CHANGE IT. IT SEEMS VERY SIMPLE.