Document.normalize_field_types method. Changes field type values [FieldChar.field_type](../../../aspose.words.fields/fieldchar/field_type/) of [FieldStart](../../../aspose.words.fields/fieldstart/), [FieldSeparator](../../../aspose.words.fields/fieldseparator/), [FieldEnd](../../../aspose.words.fields/fieldend/) in the whole document so that they correspond to the field types contained in the field codes....the keep a field’s type up to date with its field code. doc = aw...= builder . insert_field ( "DATE" , None ) # Aspose.Words automatically...