Drop shipment cancellation

Drop shipment cancellation

Hello! I have a problem and need a piece of advice. Me and my customer had a deal. I have created all the documents ( SO, PO, Invoice, Bill), however, unfortunatelly, we have to cancell it. Now, I would like to mark all these documents as void. At the same time ZOHO system alarm me that I cannot void a dropshipment documents. What is the best way, to cancel these documents and leave them in the system at the same time?