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Are you adding the attribute as a value or a trend? Do you get the same error when adding other child attributes of the same immediate parent element?
If this is a new attribute/element, you may want to make sure that PI Web API is crawled with no errors.
Let me know what you find.
Is this happening for a newly created element? When was the last crawled time for this AF Database? You can see this information at this link:
What version of PI Coresight are you running?