You can make changes to both drafted and posted Manual Voucher. When it's a draft status, it simply gets updated but when you edit a posted journal voucher, it cancels the old one automatically and recreates a new one.
Edit a Journal Voucher
1. Go to Transactions and click Others.
2. Click Manual Voucher.
3. Select the Voucher to be edited.
4. Click Edit.
5. Make the changes and click Update.
Deleting a Journal Voucher
1. To delete a JV, select the one that needs to be deleted.
2. Click Delete.