How To Fix DMC_RT_MSG189 - Missing key relationship in &1

SAP Error Message - Details

• Message type: E = Error

• Message class: DMC_RT_MSG - DMC: Runtime Object Messages

• Message number: 189

• Message text: Missing key relationship in &1

What causes this issue?

The key values on the &V1& tab differ from the key values on the &V2&
tab.

System Response

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

How to fix this error?

Make sure that the key relationship is consistent on both tabs.
Check whether the key columns contain a typing error or whether the
corresponding key is missing.

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 DMC_RT_MSG189 - Missing key relationship in &1 ?

  The SAP error message DMC_RT_MSG189, which states "Missing key relationship in &1," typically occurs in the context of Data Migration Cockpit (DMC) or during data migration processes. This error indicates that there is a missing key relationship between the data entities being processed, which is essential for maintaining data integrity and ensuring that the relationships between different data records are correctly established.
  Cause:
  
  
  Missing Foreign Key Relationships: The error often arises when there are foreign key relationships that are not defined or are missing in the data being migrated. This can happen if the source data does not have the necessary keys to establish relationships with other data entities.
  
  
  Incorrect Data Mapping: If the mapping of fields between the source and target systems is incorrect or incomplete, it can lead to missing relationships.
  
  
  Data Integrity Issues: If the data in the source system has integrity issues, such as orphaned records or missing references, this can trigger the error.
  
  
  Configuration Issues: Sometimes, the configuration of the migration project may not be set up correctly, leading to missing relationships.
  
  
  Solution:
  
  
  Check Data Relationships: Review the source data to ensure that all necessary foreign key relationships are present. Make sure that all records that should be linked are correctly referenced.
  
  
  Validate Data Mapping: Ensure that the mapping of fields between the source and target systems is correct. Verify that all required fields are included in the mapping and that they correspond to the correct keys.
  
  
  Data Cleansing: If there are integrity issues in the source data, perform data cleansing to fix any orphaned records or missing references. This may involve adding missing keys or correcting existing data.
  
  
  Review Migration Configuration: Check the configuration of the migration project in the Data Migration Cockpit. Ensure that all necessary settings are correctly configured to establish the required relationships.
  
  
  Use Data Migration Tools: Utilize SAP's data migration tools and functionalities to help identify and resolve issues related to missing relationships. Tools like the Data Services or LSMW (Legacy System Migration Workbench) can assist in this process.
  
  
  Consult Documentation: Refer to SAP documentation or support notes related to the specific version of SAP you are using for any additional guidance or known issues.
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found.
  Testing: After making changes, conduct thorough testing to ensure that the data migration process works as expected and that all relationships are correctly established.
  
  By following these steps, you should be able to identify the cause of the DMC_RT_MSG189 error and implement a solution to resolve it.