How To Fix TG450 - Table & is losing customer fields, although it did not appear in SPDD

SAP Error Message - Details

• Message type: E = Error

• Message class: TG - Messages for Upgrade Repository Switch

• Message number: 450

• Message text: Table & is losing customer fields, although it did not appear in SPDD

What causes this issue?

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

INCLUDE 'DDFD_DEL' OBJECT DOKU ID TX
The specified table was not recognized as user-modified by the object
filter of transaction SPDD. Probably fields were inserted without
setting the repair flag for the table.

System Response

During the conversion, the data contained in these fields is lost.

How to fix this error?

INCLUDE 'DDFD_SOLUTION' OBJECT DOKU ID TX

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message TG450 - Table & is losing customer fields, although it did not appear in SPDD ?

  The SAP error message TG450 typically indicates that there is an issue with a table losing customer fields during a system upgrade or support package installation. This can happen when the system attempts to adjust the database structure, and it may not properly recognize or retain custom fields that have been added to standard SAP tables.
  Cause:
  
  Table Modification: The table in question may have been modified in a way that is not recognized by the upgrade process. This can happen if custom fields were added directly to the database without proper SAP enhancement techniques.
  Upgrade Process: During an upgrade or support package installation, the system may attempt to adjust the structure of the table, leading to the loss of custom fields if they are not properly handled.
  SPDD (SAP Package Development Dictionary): If the custom fields do not appear in SPDD, it indicates that the system did not recognize them as valid modifications, which can lead to their loss during the upgrade.
  
  Solution:
  
  Check Custom Fields: Verify that the custom fields were created using the appropriate SAP enhancement techniques, such as using the append structure or custom fields functionality.
  Recreate Custom Fields: If the custom fields are lost, you may need to recreate them after the upgrade. Ensure that they are added using the correct methods to avoid future issues.
  Use SPDD: If the custom fields are not appearing in SPDD, you may need to manually add them to the SPDD adjustment. This can involve creating a new append structure for the table and ensuring that it is included in the upgrade process.
  Consult SAP Notes: Check for any relevant SAP Notes that may address this specific issue. SAP frequently releases notes that provide guidance on handling specific upgrade-related problems.
  Testing: After making adjustments, thoroughly test the system to ensure that the custom fields are retained and functioning as expected.
  
  Related Information:
  
  SAP Enhancement Framework: Familiarize yourself with the SAP enhancement framework, which provides guidelines on how to properly extend standard SAP tables without risking data loss during upgrades.
  Backup: Always ensure that you have a backup of your data and customizations before performing any upgrades or support package installations.
  Documentation: Keep detailed documentation of any custom fields and modifications made to standard tables, as this will help in troubleshooting and during future upgrades.
  
  If the issue persists or if you are unsure about the steps to take, it may be beneficial to consult with an SAP Basis or ABAP consultant who can provide more tailored assistance based on your specific system configuration.