I am very certain that there is no report that can erase stock from your inventory.
There is a transaction LX23 that posts stock in inventory management to match with the stock in warehouse management.
But your case is the other way around. So you can only to the LX23, which will add stock in IM. Subsequently you can do a physical cóunt and remove this stock again.
In standard it is not possible to post a goods issue before the TO is confirmed. Only the TO confirmation updates the picking quantity in the delivery and changes the WM status to C, which is the basis for a goods issue.
I would like to see some screenshots from your delivery, e.g. from the document flow, from the status at header and item level, and from the change history
This could help to determine why you could post a goods issue even the TO was not confirmed.