How To Fix DT106 - Append structure & is used in more than one table:

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 106

• Message text: Append structure & is used in more than one table:

What causes this issue?

An append structure may only be assigned to one table. This condition
has been violated.

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?

An append structure can only ever be used in one table. If you have to
append the same fields to several tables, you should store these fields
in a structure.
Then create an append structure for each table to which you wish to add
fields and, in each case, include the structure in the relevant append.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DT106 - Append structure & is used in more than one table: ?

  The SAP error message DT106 indicates that an append structure is being used in more than one table, which is not allowed in the context of certain operations, such as when trying to activate or transport the append structure. This error typically arises during the development or modification of database tables and structures in the ABAP Dictionary.
  Cause:
  
  Multiple Usage: The append structure has been assigned to more than one database table. In SAP, an append structure can only be associated with a single table to maintain data integrity and consistency.
  Transport Issues: If the append structure is included in a transport request and is being transported to a system where it is already used in another table, this can trigger the error.
  Development Environment: The error may also occur if there are inconsistencies in the development environment, such as multiple developers working on the same append structure or table.
  
  Solution:
  
  Check Usage: Identify all the tables that are using the append structure. You can do this by navigating to the append structure in the ABAP Dictionary (transaction SE11) and checking the "Where-Used List" to see which tables are associated with it.
  Remove Redundant Associations: If the append structure is indeed associated with multiple tables, you will need to decide which table it should remain associated with and remove it from the others. This may involve creating a new append structure for the additional tables.
  Recreate the Append Structure: If necessary, you can delete the append structure and recreate it, ensuring that it is only associated with the intended table.
  Transport Management: If the issue arises during transport, ensure that the transport request is correctly configured and that the append structure is not being included in multiple requests that could lead to conflicts.
  Consult Documentation: Review SAP documentation or consult with your SAP Basis or ABAP team for best practices regarding append structures and their usage.
  
  Related Information:
  
  Transaction Codes: Use SE11 (Data Dictionary) to view and manage tables and structures, and SE80 (Object Navigator) for a broader view of development objects.
  SAP Notes: Check SAP Notes for any known issues or updates related to append structures and this specific error message.
  Development Guidelines: Follow SAP's development guidelines to avoid conflicts and ensure proper usage of append structures in your projects.
  
  By addressing the cause of the error and following the suggested solutions, you should be able to resolve the DT106 error and proceed with your development work in SAP.