| columnName | (optional) string | Name of column in report | [default to undefined] |
| required | (optional) boolean | If true, column is required in all reports, and this entry is immutable. A 400 error will result from any attempt to modify the column's definition. | [default to false] |
| included | (optional) boolean | If true, column is included in the report. A 400 error will be thrown if an attempt is made to set included=false if required==true. | [default to false] |
| order | (optional) number | Relative sort order for the column. Columns will be displayed left-to-right in nondecreasing order. | [default to undefined] |