I have an Oracle 11 database on a development server. I'm trying to execute a stored procedure:
declare
    date_start varchar2(15);
    date_end varchar2(15);
begin
    Fecha_inicio := '01/01/2014';
    Fecha_fin := '01/01/2016';
    FCBK.PKG_PACKAGE.Generate(Fecha_inicio,Fecha_fin);
end;  
If I execute the procedure from SQL Developer or from SQL*Plus on my personal Windows machine, the procedure has no problem.
If I execute the procedure from SQL*Plus in the development server (IBM AIX Machine), the procedure ends with this error:
ORA-06502: PL/SQL: numeric or value error: character string buffer too small
				
                        
Problem solved. Was a internal error of the package. Thanks for all the answers.