ERROR_DS_ATT_NOT_DEF_IN_SCHEMA - 8303 (0x206F)
A reference to an attribute that is not defined in the schema occurred.
Updated: Feb 21, 2026
Technical Meaning
This error indicates that a reference to an attribute was made in the context of a directory service operation, but the specified attribute is not defined within the schema. This can occur during operations such as adding or modifying entries in Active Directory.
Error Details
The error code 8303 (0x206F) signifies that there has been an attempt to use an attribute name that does not exist in the directory service schema. This could be due to a misconfiguration, incorrect naming of attributes, or issues with the schema itself.
Usage Context
This error is typically encountered when performing operations on Active Directory objects using the Windows API. It can also arise during LDAP operations where an attribute name is used that does not conform to the defined schema.
Developer Interpretation
Developers should ensure that all attributes used in their code are correctly defined within the directory service schema. This includes verifying the names and types of attributes before performing any operations. Misuse of attribute names can lead to this error, which may prevent successful execution of directory service operations.
Related Errors
- ERROR_DS_ATT_ALREADY_EXISTS: An attempt was made to add an attribute that already exists in the schema.
- ERROR_DS_DRA_SCHEMA_CONFLICT: A schema conflict occurred during replication or synchronization.
- ERROR_DS_NAME_NOT_UNIQUE: The name used for an object is not unique within the directory service.
FAQ
Q: What does this error mean?
A: This error indicates that a non-existent attribute was referenced in a directory service operation. Ensure all attributes are correctly defined and named according to the schema.
Q: How can I resolve this issue?
A: Verify that the attribute names used in your operations match those defined in the schema. Correct any mismatches before retrying the operation.
Summary
The error code 8303 (0x206F) - ERROR_DS_ATT_NOT_DEF_IN_SCHEMA, signifies a reference to an undefined attribute within the directory service schema. Developers should ensure that all attributes used are correctly defined and named according to the schema specifications.