How can I unreserved quantity, Reserved against a closed / canceled sale order

Problem

In one of my operating unit sale officer enter order and released to ware house, after that sale officer cancel that sale order. Now it showing me quantity reserved for that sale order in system but actually order is canceled how can I unreserved this quantity

Solution

For 11i – 11.5.7 / INV.G and above
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Download and review Patch.3170660 “script i2471362.sql not correcting orders for cancelled qty”

Run i2471362.sql to remove any old reservations

To delete a reservation manually

NAVIGATE to INV/On hand Availability/ Reservations Query up the item and find the associated row for the order Place cursor on the row to be deleted and click on delete icon and save icon.

Reference

Metalink Note Id 150081.1