Welcome to the Community, @don510. Let me share some information about the voided invoice.
To begin with, are you trying to restore a voided invoice? If so, while we can't directly restore voided transactions, we can recover the details of the deleted transaction by going to the audit log and then re-enter the transaction manually.
Here's how:
Go to the Gear or Settings ⚙️ icon and select Audit Log.
Click the drop-down list for Filter ▼, then select the appropriate user, date, and event(s).
Click Apply.
Locate the voided transaction.
Select View under the History column.
Take note of all the information necessary to re-enter the transaction. (Note: The amount on a voided transaction is always 0. Use the appropriate amount when re-entering the transaction).