LAST WEEK I USED THE SAME INVOICE NUMBER ADDED A letter B  OR C after the invoice number to show that it is being shipped under the same invoice, just packing slips will have the B OR C

(for back orders...to keep track of the original invoice and the shipping sequence)

now I can't get the numbering to go back to the next number....they are all coming up B   

i.e.   should be 3562797  in normal sequence,   quickbooks is doing 3562738B  3562739B   etc...cuz of what i did...how can i get quickbooks to go back to the right sequence for new invoices  3562797  3562798  etc