I created a concept of class "Question" and type "Coded", and i never gave it any answers.
Then on the form schema, i added this field to a form.
I entered an answer concept (whose id was 797) for this field and then submit the form successfully.
When i tried to view the data i submitted, i discovered that it was not saved in the database.
Looking at the log file i saw this error message:
ERROR - ORUR01Handler.getConcept(909) |2011-10-28 01:27:38,789| Unable to find concept with code: 797 and mapping: null in hl7 message with uid: mPWxvsBnZuy5vOhCr04C