Hello
There is nothing under the sales order stock, so there is no point on checking transaction MMBE.
Also, it doesn't seems to be the case of running report SDRQCR21, as it is not an inconsistency.
When you convert the purchase requisition to purchase order and post a goods receipt to this purchase order with reference to the sales order special stock, the quantity under the customer stock will be updated.
After that, when posting the goods issue for the delivery, there will be no planning element under the customer stock and it will not be displayed anymore on MD04.
If you just want to get rid of the customer stock, you should set a reason for rejection for the sales order 3000059 and delete requisition 73515033.
BR
Caetano