Changing the Invoice Number which is validated and paid

 Hi

Is it possible to change the invoice number which is validated and paid.

Using prepayment we have validated and paid. When submitting the expense report same number is generated and while running Expense report import I get an exception "Duplicate Record"

Is there any other solution other that of using update through back end updating invoice_num column in AP_invoices_all table

Thanks in advance

Shera