Use WHEN-VALIDATE-ITEM to ensure no invalid characters:
Setting up Oracle Database 10g Developer 6i for Arabic and Urdu support can be a daunting task, especially for developers who are new to working with Unicode characters and RTL (Right-to-Left) languages. The process requires careful configuration of various components, including the database, Developer 6i, and the operating system. including the database
: In Regional and Language Options , set the "Language for non-Unicode programs" (System Locale) to Arabic or Urdu . including the database