Is giving error put the value "True" by default.

General
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http://support.backendless.com/public/attachments/5ff0230566379c6bb856b85988822e4c.png</img>

5ff0230566379c6bb856b85988822e4c.png
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Could you provide more details with instructions for how we can reproduce the problem?

3

Hello.
This is expected result.
If you want to set values to the newly added column (for old records), you should use bulk update.
See documentation: https://backendless.com/documentation/data/rest/data_updating_data_objects.htm