Consider this scenario:
You have a Sharepoint list which includes a Person or Group column. You create an InfoPath form with a data connection to the list. In this form, you add a rule that uses a query field to query the list for all items with a specific value in this column. You publish the form, and the queries are successful.
On SharePoint, you edit the list settings. You click on the column name to edit it. Under Additional Settings, you select a different value for Show Field, and then click OK to save your changes. Now, queries from the form fail.
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