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I’ve seen that once or twice before but haven’t traced what caused it.
Based on memory, I believe this happens when you have a primary field view that references another primary field. (Ie. you’re traversing multiple tables to get the primary view field for display purposes on a database record).
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@dan1 is on the right track … its where the primary field isn’t a field on the data table. This can happen if the primary key field is removed or changed, now I’m uncertain if both apply.
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