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

TG451 - Overview

• 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