PowerDesigner - DDL generation

Question

Where can I customize the output of DDL scripts generated by PowerDesigner? I want for all columns defined as varchar2 to generate the DDL with char length types. E.g. VARCHAR2(10 CHAR) instead of VARCHAR2(10)

Of course i have the option to modify the physical model, where I can change the data types but i want to avoid to do this for all models and to mitigate at generation time.

Thanks, Madalin