Some catalogs are defined in the database as array fields. For example, in CRM.pad's LSI template, the fields Qualification, Qualification2 and Qualification3 read their data from the same catalog.
In this case you can set the colspan attribute for the first field (e. g. Qualification). This results in only one field being displayed in CRM.pad. The user can select multiple entries, max. the number of fields that have been combined with the colspan attribute.