How To Fix DMC_RT_MSG145 - Source system data structure is different to target system data structure

SAP Error Message - Details

• Message type: E = Error

• Message class: DMC_RT_MSG - DMC: Runtime Object Messages

• Message number: 145

• Message text: Source system data structure is different to target system data structure

What causes this issue?

When trying to write data to the target system, it was detected that a
source system data structure is different to the corresponding target
system data structure (as defined in the ABAP Dictionary).

System Response

The system stops the replication process.

How to fix this error?

Ensure that the source system data structures are consistent with the
corresponding target system data structures.

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 DMC_RT_MSG145 - Source system data structure is different to target system data structure ?

  The SAP error message DMC_RT_MSG145 indicates that there is a mismatch between the data structure of the source system and the target system during a data migration or replication process. This error typically occurs in the context of SAP Data Migration Cockpit (DMC) or SAP Landscape Transformation (SLT) when the data model or schema of the source and target systems do not align.
  Causes:
  
  Schema Differences: The source and target systems may have different table structures, such as missing fields, additional fields, or different data types.
  Version Mismatch: The source and target systems may be running different versions of SAP, leading to discrepancies in data structures.
  Configuration Issues: Incorrect configuration settings in the data migration or replication setup can lead to mismatches.
  Data Model Changes: Changes in the data model in either the source or target system that have not been synchronized can cause this error.
  Custom Fields: If custom fields have been added to either system, this can lead to structural differences.
  
  Solutions:
  
  Compare Data Structures: Use tools or scripts to compare the data structures of the source and target systems. Identify any discrepancies in table definitions, field types, and lengths.
  Adjust Data Mapping: Modify the data mapping configuration in the DMC or SLT to ensure that the fields in the source system correctly correspond to the fields in the target system.
  Update Schema: If possible, update the schema of the source or target system to ensure they match. This may involve adding or removing fields or changing data types.
  Check Configuration: Review the configuration settings in the data migration or replication setup to ensure they are correct and aligned with the data structures.
  Consult Documentation: Refer to SAP documentation for any specific requirements or guidelines related to the data migration process you are performing.
  Testing: After making adjustments, perform a test migration to ensure that the error is resolved and that data is being transferred correctly.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to DMC or SLT that may address this error.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found.
  Data Migration Cockpit Documentation: Review the official SAP documentation for the Data Migration Cockpit for best practices and troubleshooting tips.
  Version Compatibility: Ensure that both the source and target systems are compatible in terms of version and configuration.
  
  By addressing the underlying causes and following the suggested solutions, you should be able to resolve the DMC_RT_MSG145 error and successfully complete your data migration or replication process.