How To Fix RSTRAN351 - Rule (target: &2 group: &3): No key fields assigned

SAP Error Message - Details

• Message type: E = Error

• Message class: RSTRAN - Messages for Transformation

• Message number: 351

• Message text: Rule (target: &2 group: &3): No key fields assigned

What causes this issue?

No valid key fields are assigned.

System Response

The data cannot be read again. An error message is displayed.

How to fix this error?

Assign key fields to the rule and check whether the selected DataStore
object has key fields. A semantic key is required for write-optimized
DataStore objects.
There must be at least one valid key field.

Procedure for System Administrators

Internal rule ID &V1&

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 RSTRAN351 - Rule (target: &2 group: &3): No key fields assigned ?

  The SAP error message RSTRAN351 indicates that there is an issue with the assignment of key fields in a transformation rule. Specifically, it means that the target structure (indicated by &2) in the transformation (group &3) does not have any key fields assigned. This can occur in the context of data transfer processes, especially when working with data transformations in SAP BW (Business Warehouse).
  Cause:
  
  Missing Key Fields: The target structure in the transformation does not have any key fields defined. Key fields are essential for identifying unique records in the target data structure.
  Incorrect Mapping: The mapping between the source and target structures may not have been set up correctly, leading to the absence of key fields in the target.
  Transformation Configuration: The transformation might not have been fully configured, or there may be an oversight in the setup process.
  
  Solution:
  
  
  Check Transformation Settings:
  
  Go to the transformation in the SAP BW system.
  Verify the target structure and ensure that key fields are defined. Key fields are typically fields that uniquely identify records, such as IDs or codes.
  
  
  
  Assign Key Fields:
  
  If key fields are missing, you need to assign the appropriate key fields to the target structure. This can be done in the transformation maintenance screen.
  Ensure that the key fields in the target structure correspond to the key fields in the source structure.
  
  
  
  Review Mapping:
  
  Check the mapping between the source and target fields. Ensure that the key fields from the source are correctly mapped to the key fields in the target.
  If necessary, adjust the mapping to include the required key fields.
  
  
  
  Activate the Transformation:
  
  After making changes, ensure that you activate the transformation to apply the updates.
  
  
  
  Test the Transformation:
  
  Run a test load to verify that the transformation works correctly and that the error message no longer appears.
  
  
  
  Related Information:
  
  Key Fields in SAP BW: Key fields are crucial for data integrity and are used for data retrieval and reporting. They help in uniquely identifying records in InfoProviders.
  Transformation Maintenance: In SAP BW, transformations are used to define how data is transferred from a source to a target. Proper configuration is essential for successful data loads.
  SAP Notes and Documentation: If the issue persists, consider checking SAP Notes or the official SAP documentation for any specific guidance related to your version of SAP BW.
  
  By following these steps, you should be able to resolve the RSTRAN351 error and ensure that your transformation is correctly configured.