How To Fix RSM2721 - No semantic key fields selected despite serialization

SAP Error Message - Details

• Message type: E = Error

• Message class: RSM2 - Monitor assistant help texts

• Message number: 721

• Message text: No semantic key fields selected despite serialization

What causes this issue?

The existing DTP requires a serialized update because fields are updated
non-commutatively during the processing run (for example, MOVE).
You have not selected a field as the semantic key in the error handling.
Therefore the system cannot perform error handling.

System Response

As the system terminates requests of this type as soon as incorrect
records are found anyway (even if records were incorrect in previous
requests), the system terminates the generation of the DTP.

How to fix this error?

Select at least one field in the <LS><ZH>Semantic Groups</></> dialog
box.

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 RSM2721 - No semantic key fields selected despite serialization ?

  The SAP error message RSM2721, which states "No semantic key fields selected despite serialization," typically occurs in the context of SAP BW (Business Warehouse) or SAP HANA when dealing with data extraction or data loading processes. This error indicates that the system expects certain key fields to be defined for the data being processed, but none have been selected, even though serialization is enabled.
  Cause:
  
  Missing Key Fields: The most common cause of this error is that the data model or InfoObject does not have any semantic key fields defined. Semantic key fields are essential for uniquely identifying records in the data model.
  Incorrect Configuration: The configuration of the data source or the transformation might not be set up correctly, leading to the absence of key fields.
  Data Source Issues: The data source from which data is being extracted may not have the necessary key fields defined or may not be compatible with the target structure.
  Serialization Settings: If serialization is enabled but no key fields are defined, the system cannot process the data correctly.
  
  Solution:
  
  
  Define Key Fields: Ensure that the necessary semantic key fields are defined in the InfoObject or data model. You can do this by:
  
  Going to the InfoObject maintenance transaction (e.g., RSA1 for InfoObjects).
  Checking the key fields and ensuring that at least one field is marked as a key field.
  
  
  
  Check Data Source Configuration: Review the configuration of the data source and transformation:
  
  Ensure that the data source is correctly mapped to the target InfoObject.
  Verify that the transformation rules include the necessary key fields.
  
  
  
  Review Serialization Settings: If serialization is enabled, consider whether it is necessary for your scenario. If not, you may disable it. If it is required, ensure that the key fields are properly defined.
  
  
  Test Data Load: After making the necessary changes, perform a test data load to verify that the error has been resolved.
  
  
  Consult Documentation: If the issue persists, refer to SAP documentation or support notes related to the specific version of SAP BW or HANA you are using, as there may be version-specific considerations.
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that might 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 found effective.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as RSA1 (Data Warehousing Workbench), RSMO (Monitor Data Load), and others that may help in troubleshooting.
  
  By following these steps, you should be able to identify the cause of the RSM2721 error and implement a solution to resolve it.