Hi steenie!

You should use DBMS_SQL.varchar2s type:
lvar_cre DBMS_SQL.varchar2s; 



DBMS_SQL.PARSE ( 

   c             IN INTEGER, 

   statement     IN VARCHAR2S,

   lb            IN INTEGER, 

   ub            IN INTEGER, 

   lfflg         IN BOOLEAN, 

   language_flag IN INTEGER);