What is the name of use case of this type
Say there is feature that is accessible to different users using that they can submit the application if there is one unique id.
I have logged in as user-01 in one browser and clicked on the feature and entered the unique id and it auto-populate all the details but i haven't submitted the application I have kept the tab open.
Same the way for second user in different browser accessing the feature but application not submitted.
If user-01 submits the application acknowledgment is generated. then user-02 can also submit it but should be validated not to submit.
What is the name of this use case?
Seems like a unique constaint. But I would discuss naming with your team. Naming things is hard and domain specific. Maybe Domain Driven Design helps with naming functionality better.