Reverse Receipt with a partial qty moved to STK in Receipt Routing

Hi,

I have the next scenario.

1. We received some material from Purchase Order and entered into Receipt Routing P43250. (Example 100 pcs)
2. Only a partial quantity of the receipt has been moved to the last step of the receipt routing to the warehouse (Example 75 pcs)
3. The remaining 25 pcs require to be reversed since these piece were not truly shipped by the vendor, and need to be added again to the open quantity of the purchase order.

How can I do the step 3, in the Receipts Inquiry P43214 when trying to reverse I receive error that the receipt is not able to be reversed since it has quantity in Receipt Routing. Be aware, that the 25 pcs have been reversed in the receipt routing to the first Operation Code.