Corrections mean rework. The higher the % the higher the cost of the process.
3. What is the average number of line items for each process driver?
If you need to cross match as part of the process (eg: invoice to purchase order to goods receipt; time sheet to personnel to pay rates; sales order to delivery note to invoice) then processing a 1-1-1 match is easier than a 30-17-22 match. If you are doing this sort of matching you will appreciate that there are never the same number of lines on the documents to be cross matched. A low number of lines to match will also make automation easier.