Lock Modes

Fulfillment Subscriber Inventory supports two modes of locking. You can configure the modes of locking as per your requirements.

Locks are Advisory You can always perform an update on an item or a party. You have to check if you need to perform an update or not.
Locks are Hard You cannot perform an update if the entity is locked and you were not the one to implement the lock. The default lock mode for all users is hard lock, except the user whose role is admin. The admin user role, by default, has the PERM_UPDATE_WHEN_NOT_LOCK_OWNER permission.