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Check for duplicate

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Good afternoon! I have a field where duplicates should not be stored. The value for this field is generated automatically.

I created the following check:
d2:countIfValue(A{caseID}, A{caseID}) > 1.

However, it doesn’t work consistently: sometimes it triggers, and sometimes it doesn’t. Has anyone faced a similar issue? Could you please suggest a proper solution? Thank you in advance for your help!

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