How To Fix EM146 - Data type &1 (migr. object &2) in migration object &3 already exists

SAP Error Message - Details

• Message type: E = Error

• Message class: EM - IS-U Migration

• Message number: 146

• Message text: Data type &1 (migr. object &2) in migration object &3 already exists

What causes this issue?

The data types of a migration object cannot be used more than once.
Data type &V1& already exists in migration object &V3&. Migration
object &V2& cannot not be created as a referenced migration object in
hyper object &V3&.

System Response

INCLUDE ISU_VERARB OBJECT DOKU ID TX

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.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message EM146 - Data type &1 (migr. object &2) in migration object &3 already exists ?

  The SAP error message EM146 indicates that there is a conflict during a data migration process. Specifically, it means that a data type (identified by &1) for a migration object (identified by &2) already exists in the target system for the specified migration object (identified by &3). This typically occurs when you are trying to import or migrate data that has already been imported or exists in the system.
  Cause:
  
  Duplicate Data: The most common cause is that the data you are trying to migrate already exists in the target system. This can happen if the migration process was run previously, or if there are overlapping data entries.
  Incorrect Mapping: There may be an issue with how the data is mapped during the migration process, leading to attempts to create duplicate entries.
  Data Integrity Issues: There may be integrity constraints in the target system that prevent the creation of duplicate entries.
  
  Solution:
  
  Check Existing Data: Before running the migration again, check the target system for existing entries related to the migration object. You can use transaction codes or reports to view the existing data.
  Adjust Migration Data: If duplicates are found, you may need to adjust your migration data to avoid conflicts. This could involve:
  
  Removing duplicates from the source data.
  Modifying the data to ensure it does not conflict with existing entries.
  
  
  Use Update Instead of Insert: If the intention is to update existing records rather than create new ones, ensure that the migration process is set to update existing records instead of inserting new ones.
  Error Handling: Implement error handling in your migration process to catch and log such errors for further analysis.
  Consult Documentation: Review SAP documentation related to the specific migration object you are working with for any additional guidelines or best practices.
  
  Related Information:
  
  Migration Objects: Understand the specific migration object you are working with, as different objects may have different rules and constraints.
  SAP Notes: Check SAP Notes for any known issues or patches related to the migration process you are using.
  Transaction Codes: Familiarize yourself with relevant transaction codes (e.g., LSMW, LTMC) that are used for data migration in SAP.
  Data Migration Tools: Consider using SAP's data migration tools, such as SAP Data Services or SAP S/4HANA Migration Cockpit, which may provide more robust handling of data conflicts.
  
  By following these steps, you should be able to resolve the EM146 error and successfully complete your data migration process.