Reserving object at database

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I want an item unchanged when a user is busy with that item. How can I prevent other users to make a change with an object in the period of time when one user retrieves it and busy with a process to change it.
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The technique you are looking for is pessimistic record locking. Mendix by default uses optimistic locking. Here is a forum question answering your needs: https://forum.mendix.com/link/questions/91218 even having a sample app for you: https://appstore.home.mendix.com/link/app/109405/Karona-Consulting/Pessimistic-Locking

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