Autoinvoice got error message of complete your tax/revenue accounting flexfield

 I defined autoaccounting of Tax and revenue account. And segment 2 is come from salesperson. The account string of salesperson have been defined.

When enter a order, no salesperson has been entered at order header. We enter the salesperson at order line. There is a customization which use item to define salesperson. That means when enter a item at order line, its salesperson will appear at order line.

Although each order line has salesperson and the account string in salesperson is define. I still got the errors below after runing autoinvoice:
Errors: 1) Please complete your tax accounting flexfield (9752..00000.272101.00000.0000.00000.00000.00000.000000)
2) Please correct the revenue account assignment (9752..00000.411101.34810.0000.00000..00000.000000)