Hello,
For your purpose you can inspire you with this blog : Set soft state to OData service
But, I will not advice you this because it will require lot of resources (depend on howmany users).
If you want keep a lock a long time more than few minutes, you can imagine something like using a Worklow started by the UI which (the WF) will lock the order until the UI unlock it (without Soft state method).
Regards,
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