How To Fix TG457 - **** Start of check for loss of customer fields

SAP Error Message - Details

• Message type: E = Error

• Message class: TG - Messages for Upgrade Repository Switch

• Message number: 457

• Message text: **** Start of check for loss of customer fields

What causes this issue?

In this phase of the upgrade, there is a check whether there are
conversions which cause the accidental deletion of customer fields (and
therefore of the data contained in them). In particular, cnversions of
pooled or cluster tables having more than 255 fields is reported. The
conversion of such tables should be avoided since they are not possible
on the ADABAS, DB2/6000, MSS and ORACLE database systems.

System Response

If accidental deletions of customer fields are detected, they will be
marked in the log.

How to fix this error?

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

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 TG457 - **** Start of check for loss of customer fields ?

  The SAP error message TG457, which indicates "Start of check for loss of customer fields," typically arises during the process of data migration or system upgrades, particularly when there are changes in the data model or structure that could potentially lead to the loss of custom fields or customer-specific enhancements.
  Cause:
  
  Data Model Changes: The error often occurs when there are changes in the underlying data model of the SAP system, such as during an upgrade or when implementing new functionalities that may not support existing custom fields.
  Incompatibility: Custom fields that were previously defined may not be compatible with the new version of the software or the new data structure.
  Missing Customizations: If custom fields were not properly migrated or if the related enhancements were not included in the upgrade, this error may be triggered.
  
  Solution:
  
  Check Custom Fields: Review the custom fields in the affected areas of the application. Ensure that they are still defined and compatible with the new data model.
  Adjust Enhancements: If the custom fields are no longer supported, you may need to adjust or recreate the enhancements to align with the new data structure.
  Use SAP Tools: Utilize SAP tools such as the Custom Code Migration Worklist or the SAP Upgrade Guide to identify and resolve issues related to custom fields.
  Testing: Conduct thorough testing after making changes to ensure that the custom fields function as expected and that there are no data loss issues.
  Consult Documentation: Refer to SAP Notes and documentation related to the specific version upgrade or migration you are performing. SAP often provides guidance on handling custom fields during upgrades.
  
  Related Information:
  
  SAP Notes: Check for relevant SAP Notes that may provide specific guidance or patches related to the TG457 error.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have implemented.
  Backup: Always ensure that you have a backup of your data and customizations before performing upgrades or migrations to prevent data loss.
  
  If the issue persists after following these steps, it may be beneficial to consult with SAP support or a qualified SAP consultant for further assistance.