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Item is a generic type object. Not physical. Represent all building elements ans equipments
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Parent and Child Item
Parent Item is an Item That has child Items.
Child Item is an Item with a relation to a parent Item. The child Item inherits data from the parent.
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Sub Item
Sub Item is an Item that is nested into another main Item. An Item can have several Sub Items that forms a union/ assembly / bundle. If the main item is placed in a room or system, occurrence of the sub item will automatically be created.
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