Assuming the following:
- Entity named Individual
- Nested attribute under Individual named Phone
- Simple Boolean typed attribute under that named Primary Phone Flag
Then here are the steps to create the appropriate DVF:
- Navigate to the data modeler
- Select the Individual entity
- Select Validation Functions
- Select Create New
- Fill out the required fields. See the attached screenshot for details.

Note that if you just want a message, select "Warning". If you want to prevent data from being created with a Primary Phone Flag value of No, then select "Error".
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Trevor Burn
Assent
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Original Message:
Sent: 10-13-2025 06:59
From: Priyam Shukla
Subject: DVF for List of Phone Numbers
Hi Team
I want to implement DVF for list of Phone numbers having Primary Phone Flag value as No , should display error message.
Thanks
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Priyam Shukla
EPAM
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