From the S/4HANA Cloud Public Edition connected the Warehouse Management perspective, it is not feasible to delete an outbound transportation oregon a transportation item. To cancel oregon cull an outbound transportation effectively, you request to "zero out" the applicable items. If you request to cancel the full delivery, you whitethorn zero each the items wrong that delivery.
For elaborate guidance connected however to "reject" an outbound transportation and further accusation connected reversing a posted goods issue, delight notation to the pursuing KBAs:
3126573 - How to reverse outbound deliveries astatine EWM S/4HANA Cloud Public Edition system
Best regards,
SAP Support