with this work item custom control, you can validate the uniqueness of work item field value before saving
Unique Field Control
This Custom work item field control can help you validate the uniqueness of work item field value before saving.
Click organization settings | process, select the custom process and a work item type, then click add custom control.
Select Unique Filed Control and click option menu.
Select a work item field you want to validate (it must be a string)
Add a lable for this custom control, just keep it as same as the field you want to validate.
Hide or remove the origin field control.
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