Parts and Articles within this Companion Specification are composed of structures from two distinct sources: the ISA-95 Material Model from ISA95, which is intended for generic use, and the domain-specific VEC (Vehicle Electric Container) model. As these have both been integrated within this Companion Specification, Part and Article always consist of two segments: the generic component derived from the ISA-95 model, and the wire harness-specific element from the VEC model.

When adding a Parts, Article, or Job, it must be fully described and only reference existing elements. For example, when a new Job is added, it must reference already existing Parts and Articles within the system. When deleting elements, the integrity of the remaining data must not be compromised. This means the system must always ensure there are no references to missing or not yet transferred elements. For instance, if an Article is deleted, the system must verify that no existing Jobs reference this Article to maintain data consistency.