How To Fix DT406 - Append structure & cannot be appended to table of type &

SAP Error Message - Details

• Message type: E = Error

• Message class: DT - Table activation (incl. indexes)

• Message number: 406

• Message text: Append structure & cannot be appended to table of type &

What causes this issue?

The specified append structure was defined for a table which is neither
a structure nor a transparent table.
Appends are only permitted for the above-mentioned types of tables.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Change the table type or delete the append structure.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DT406 - Append structure & cannot be appended to table of type & ?

  The SAP error message DT406 indicates that there is an issue with appending an append structure to a table. Specifically, the message states that the append structure cannot be appended to a table of a certain type. This typically occurs when you are trying to add an append structure to a table that does not support it, or when there are compatibility issues between the append structure and the base table.
  Cause
  
  Table Type Restrictions: The base table may be a pooled or cluster table, which does not support append structures. Append structures can only be added to transparent tables.
  Data Element Compatibility: The data elements in the append structure may not be compatible with the existing fields in the base table.
  Table Locking: The base table might be locked for changes, preventing the append structure from being added.
  Incorrect Configuration: There may be configuration issues or inconsistencies in the data dictionary.
  
  Solution
  
  Check Table Type: Verify that the base table is a transparent table. If it is a pooled or cluster table, you cannot append an append structure to it.
  Review Data Elements: Ensure that the data elements in the append structure are compatible with the existing fields in the base table. Check for data type mismatches or length issues.
  Unlock the Table: If the table is locked, you may need to unlock it or wait until the lock is released before attempting to append the structure again.
  Use a Different Approach: If the base table cannot be modified, consider using a different approach, such as creating a new custom table or using a different enhancement technique (like user exits or BAdIs).
  Transport Requests: Ensure that any transport requests related to the append structure are correctly configured and released.
  
  Related Information
  
  Transaction Codes: You can use transaction codes like SE11 (Data Dictionary) to check the properties of the table and append structure.
  SAP Notes: Check SAP Notes for any known issues or additional guidance related to this error message.
  Documentation: Review SAP documentation on append structures and table types for more detailed information on their usage and limitations.
  
  If you continue to face issues, consider reaching out to your SAP Basis or ABAP team for further assistance, as they may have more insights into the specific configurations and settings in your SAP environment.