How To Fix RSEC420 - Old migration data may be overwritten incompletely

SAP Error Message - Details

• Message type: E = Error

• Message class: RSEC -

• Message number: 420

• Message text: Old migration data may be overwritten incompletely

What causes this issue?

The check of which users still have authorizations or profiles that come
from earlier migrations determined that there are more users than the
number of those that are now to be generated.
During migration, however, the authorizations (and profiles) previously
generated by migration are deleted (or entries made previously are undon
e) before analysis authorizations are regenerated.
Example:
You migrate first for users U1 and U2 and authorization object B2, and i
n the second step, for users U1 and B1. Users have authorizations as
follows:
U1: Profile1 for B1 and Profile2 for B2
U2: Profile2 for B2
During the second migration attempt, all authorizations or migrated prof
iles that user U1 already has are removed. During this process, the
migration result for Profile2, which user U2 also has, would be deleted.
The system warns that the user group is incomplete (because user U2 is
missing).
You can continue and accept the inconsistency or perform the migration f
rom U1 and U2 for the two authorization objects B1 and B2 so that the
inconsistency disappears.

System Response

In interactive mode, a warning and list of the missing users appears.

How to fix this error?

If this message appears in interactive mode, you are asked how you want
to proceed (continue despite danger of inconsistencies that can be remov
ed).
Otherwise the old data is overwritten.
If you unintentionally caused an inconsistency, you can correct it by mi
grating the larger group of users again, that is, by adding the missing
users. See the example above.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message RSEC420 - Old migration data may be overwritten incompletely ?

  The SAP error message RSEC420, which states "Old migration data may be overwritten incompletely," typically occurs in the context of data migration processes, particularly when dealing with the SAP Business Warehouse (BW) or SAP BusinessObjects. This error indicates that there is a risk of losing or corrupting existing data during a migration or update process.
  Cause:
  
  Incomplete Migration Process: The error often arises when the migration process is not completed successfully, leading to potential overwriting of existing data.
  Data Consistency Issues: If there are inconsistencies in the data being migrated or if the data structure has changed, it can lead to this error.
  Configuration Issues: Incorrect settings or configurations in the migration process can also trigger this error.
  Version Mismatch: If there is a mismatch between the versions of the source and target systems, it can lead to incomplete data migration.
  
  Solution:
  
  Check Migration Logs: Review the migration logs to identify any errors or warnings that occurred during the migration process. This can provide insights into what went wrong.
  Data Validation: Ensure that the data being migrated is complete and consistent. Validate the data structure and content before starting the migration.
  Re-run Migration: If the migration was interrupted or incomplete, consider re-running the migration process. Ensure that all necessary prerequisites are met.
  Backup Data: Before performing any migration, always back up existing data to prevent loss in case of errors.
  Configuration Review: Review the configuration settings for the migration process to ensure they are correct and aligned with the requirements of both the source and target systems.
  Consult Documentation: Refer to SAP documentation or notes related to the specific version of the software you are using for any known issues or additional troubleshooting steps.
  Seek Support: If the issue persists, consider reaching out to SAP support or consulting with an SAP expert who can provide guidance based on your specific scenario.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  Migration Tools: Familiarize yourself with the tools and methods used for data migration in SAP, such as the SAP Data Services or SAP BW tools.
  Best Practices: Follow best practices for data migration, including thorough testing in a development or sandbox environment before executing in production.
  
  By addressing the underlying causes and following the recommended solutions, you can mitigate the risk of encountering the RSEC420 error during your migration processes.