Sun Java System Directory Server Enterprise Edition 6.0 Reference

Schema Checking

When adding or modifying an entry, the attributes you use must be required or allowed by the object classes in your entry, and your attributes must contain values that match their defined syntax.

When modifying an entry, Directory Server performs schema checking on the entire entry, not only the attributes being modified. Therefore, the operation may fail if any object class or attribute in the entry does not conform to the schema.