In order to restore claims that have been accidentally deleted navigate to the My Claims page. This is accessible from the side menu under Expenses.
Once in the My Claims page, click the filter button.
Click on the Deleted button in the filter options, and then select the claim you wish to restore from the list available.
Use the Save button to reinstate the claim and return it back in your draft claims.
Clicking the Submit button will reinstate the claim and it will also submit the claim.