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Define unique record

new comer
in Calculation Engine (Define Fields)

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Hi, I have two related DBs A and B, with 1:m relationship. I created a auto-enter serial # in A as primary key, and set up relationship using this field.

Now I need to provent user creating duplicate record in B. In B, a record can be identified by 3 fields (serial#, OTA code, and date).

What I did now is create a text field, auto-enter calculate value(which hold the 3 fields), and I check the unique radio box in validation. But it doesn't work.

Can someone please tell me how to do this? Thank in advance!

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https://fmforums.com/topic/17569-define-unique-record/
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