Revising Unposted Vouchers
You can change or delete an unpaid voucher before you post it. However, you cannot change these key fields:
Document Number
Document Type
Document Company
Company
Supplier Number
GL Date
Invoice Date
Business Unit (only if the alternate tax rate/area assignment constant is disabled)
To change the information in a key field, you must delete the voucher and re-enter it.
The system enables you to pay an unposted voucher if it is approved. After a pay item is paid, however, you cannot change it unless you void the payment.