You can try this:

• in the expense click on view report
• In the report on the other info tab click on the journal entry.
• in the journal entry, click reset to draft an then cancel entry
• return to the report, and delete it.
• return to the expense and delete it.

Hope this helps !

Roeland

Yes, can void the account posting instead of delete. Please refer the following link \https://www.odoo.com/apps/modules/11.0/skit_void_journal_entry/