To import the CORBA predefined types package into your model:
The CORBA package is added as a read-only (RO) reference package to the model. Because the CORBA types package is added as a reference package, no code is generated for it.
Once the CORBA package is imported, the CORBA IDL data types are displayed in the Type list (for example, when you select Type is Typedef'ed in the Operation window).