# Locks

Locks prevent certain information from being modified during automatic inventory feedback. These locks are activated when a manual modification has been made.

![Links screen](https://github.com/glpi-network/gitbook/blob/main/modules/assets/images/locks.png)

## Lock a field

To lock a field, you need to modify the data of this field manually.

When a field is modified manually, a padlock appears next to the title :

![Links screen](https://github.com/glpi-network/gitbook/blob/main/modules/assets/images/locks-activated.png)

## Unlock a field

* To unlock a field, go to the GLPI object on which the lock is located
* In the lock tab, click on the checkbox of the item to unlock
* Click on **Actions**
* Then **Delete permanently**
* And **Post**

The padlock is no longer present on the field and can now be modified by the automatic inventory.

All changes will be stored in the **historical** tab.