How To Fix TG451 - Table & loses customer fields as these were not rescued in SPDD

SAP Error Message - Details

• Message type: E = Error

• Message class: TG - Messages for Upgrade Repository Switch

• Message number: 451

• Message text: Table & loses customer fields as these were not rescued 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 recognized as user-modified by the object
filter of transaction SPDD. In phase SPDD, neither the proposal
generated for the table for saving the fields nor the option "Return to
SAP standard" was selected

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 TG451 - Table & loses customer fields as these were not rescued in SPDD ?

  The SAP error message TG451 indicates that a table has lost customer fields because they were not rescued during the SPDD (SAP Dictionary Maintenance) process. This typically occurs during an upgrade or when applying support packages, where changes to the data dictionary can lead to the loss of custom fields that were added to standard SAP tables.
  Cause:
  
  SPDD Process: During an upgrade or support package installation, the SPDD transaction is used to manage changes to the data dictionary. If custom fields were added to a standard SAP table, they need to be "rescued" during this process. If they are not rescued, they may be lost, leading to the TG451 error.
  Inadequate Review: Sometimes, the custom fields may not be properly reviewed or identified during the SPDD process, leading to their omission.
  System Configuration: The system may not be configured correctly to recognize custom fields, or there may be a lack of documentation regarding the customizations made.
  
  Solution:
  
  
  Rescue the Fields: 
  
  Go to transaction SPDD.
  Identify the table that is causing the issue.
  Check for any custom fields that need to be rescued.
  Use the option to rescue the fields, ensuring that they are included in the table definition.
  
  
  
  Manual Adjustment: If the fields were not rescued during the SPDD process, you may need to manually add them back to the table using transaction SE11 (Data Dictionary) or SE14 (Database Utility) if necessary.
  
  
  Review Customizations: Ensure that all custom fields and modifications are documented and reviewed before performing upgrades or applying support packages in the future.
  
  
  Testing: After rescuing the fields, perform thorough testing to ensure that the custom fields are functioning as expected and that there are no further issues.
  
  
  Consult SAP Notes: Check for any relevant SAP Notes that may provide additional guidance or solutions related to the specific version of SAP you are using.
  
  
  Related Information:
  
  SPDD: This transaction is crucial during upgrades and support package installations, as it allows you to manage changes to the data dictionary.
  SAP Notes: Always refer to the SAP Support Portal for notes related to your specific version and the error message TG451.
  Documentation: Maintain comprehensive documentation of all custom fields and modifications to facilitate easier upgrades in the future.
  Backup: Always ensure that you have a backup of your data and customizations before performing any upgrades or applying support packages.
  
  By following these steps, you should be able to resolve the TG451 error and prevent it from occurring in the future.