Unfortunately it is unlikely to be recoverable via Dimensions but it may be worth searching for the invoice as follows:
Click Debtors then click Customers or Creditors.
Click Suppliers or Sales Ledger.
Click Records then click Customers or Purchase Ledger.
Click Records then click Suppliers as needed (Classic menu).
Click Find then enter the account code.
Click Transactions then click List Definition.
In the Filter ensure that both Posted and Batched are checked.
If the invoice number of the missing invoice is known then Scroll down in the Search fields and enter it against Header Ref.
Set the View to All Years All Periods.
Click Display.
If the invoice does not appear (also check that the number of records returned is not being restricted) then it is not in Dimensions and will have to be rekeyed or retrieved by restoring the database to a point before the deletion took place.