The primary conceptual model consists of two ArchiMate concepts from the passive structure part. Namely data objects and business objects.

Often one of these two entities is used in the models. This depends on the further modeling, finds this place on application level then you can use the data objects, otherwise the business objects

For both entities you can use specialization and aggregation as an association. In addition, a data object realizes a business object. If desired, you can show cardinalities at the associations, but that is not common.

In addition, in a complex model or in many synonyms and homonyms, the modeling of two layers of abstraction can have added value

Is an ArchiMate concept that is used to visualize the different links between the business objects at the business level. That is actually building a so-called business glossary.
In addition, these entities can be used to visualize the links with other c

Data object is an ArchiMate concept that on the one hand can be linked to a number of ArchiMate concepts so that aspects such as quality, requirements. But also where is the dataset used and by whom, which application has a relation with this dataset etc.