At the moment it is only possible to use 1 attribute in 'source attribute' of a combobox.
When I want for instance the sequence + description ( 100 | My description) in the droplist I need to create a structure and use an advanced query to create the source record list.
It would be much easier to change the ' source attribute' property in an expression so it becomes possible to combine fields of the 'source record list' to populate the Droplist.