Datatypes defined at the logical level level are not always comprehensible for the target DBMS. In this case, they need to be converted to datatypes corresponding to the target DBMS.

This conversion intervenes notably at synchronization. Datatypes of attributes defined in the logical model are translated to datatypes for the generated columns.

Conversion is assured by an equivalence link with pivot types. The pivot types are an intermediary between logical datatypes and generated datatypes.