Determines how the tasks are sorted in the report. Multiple criteria can be specified as comma separated list. If one criteria is not sufficient to sort a group of tasks, the next criteria will be used to sort the tasks within this group.

Use 'tree' as first criteria to keep the breakdown structure.

The sorting criteria must consist of a property attribute ID. See columnid for a complete list of available attributes. The ID must be suffixed by '.up' or '.down' to determine the sorting direction. Optionally the ID may be prefixed with a scenario ID and a dot to determine the scenario that should be used for sorting. In case no scenario was specified, the top-level scenario is used. Example values are 'plan.start.up' or 'priority.down'.