For each catalog, a set of predefined items and item folders (for hierarchical catalogs) can be created during configuration development.
Such predefined items can not be deleted by users.
Only basic properties of an item (name, code, description) are entered in the Designer. Values of other attributes of a predefined item are input in the 1C:Enterprise mode.
In 1C:Enterprise mode predefined catalog items can be distinguished from user-created items by their icons: (folder and item hierarchy) and (item hierarchy) - predefined items, (folder and item hierarchy) and (item hierarchy) - user-defined ones.