IFS Cloud 26R1 Cancelling a Consignment Supplier Invoice

We are trying to cancel a ‘Posted’ consignment supplier invoice in IFS Cloud 26R1 which has been matched to 10 receipts and contains 55 posting lines. When cancelling the invoice, after 20- 30 mins it times out and invoice is not cancelled; that is, it remains in Posted status. No errors logged. No locks in database.