In Baan IVC, plan items on the lowest plan level were automatically actual items (not product families). All plan items on higher plan levels were product families.
The relationship between a product family and items on lower plan levels was defined in a planning bill of material.
In Infor LN, every family item must be defined in the Item Base Data module. A family item can exist on any plan level. The relationship between a family item and items on lower plan levels is defined in aggregation relationships.
Aggregation relationships in Infor LN are much more flexible than the planning bills of material in Baan IV. For example, users can define aggregation relationships between items on the same plan level.