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In some instances, when an attribute table is acquired from an external source, some fields may no longer be needed. When attempting to delete the field, the following error is returned:
Error: The selected field is a required field and cannot be deleted.
This error occurs because the Field IsRequired option is checked when creating the field using the Add Field tool. Once a field is set as required, new records must contain a value for the field. Required fields are permanent by design and cannot be deleted.
A workaround is to export the attribute table using the Feature Class To Feature Class tool, and remove the field in the Field Map section, as follows:
Note: Exporting the feature class to a geodatabase from the Catalog window also opens the Feature Class to Feature Class tool dialog box. Using the Feature Class to Feature Class tool creates a new instance of the attribute table, and the required field in the original attribute table is not removed.