State tax filing

Thank you.  I am in Review Mode and correcting Tax Errors.  I am on Schedule B Form 1099-OID.  The software is prompting me for a two character response when asking for the Tax Exempt Interest State ID Number for Morgan Stanley Domestic.  I have tried DE, XX, 00, MX and many others.  I have also called Morgan Stanley but they say it is a Turbo Tax question.  The software will not let me progress without entering a response.