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.