One of the requirements for samePage is that the character set should be UTF-8.
You can either check with your DBA or run the following SQL to determine whether your database character set is UTF-8.
|SELECT value$ FROM sys.props$ WHERE name = ‘NLS_CHARACTERSET’ ;|
It should return the value AL32UTF8.
Another option is to run the following SQL :
|SELECT * FROM NLS_DATABASE_PARAMETERS|
The value against NLS_CHARACTERSET should be UTF8.