How To Fix RSAU251 - No communication structure exists in version & for InfoSource &

SAP Error Message - Details

• Message type: E = Error

• Message class: RSAU - Update rules

• Message number: 251

• Message text: No communication structure exists in version & for InfoSource &

What causes this issue?

In order to be able to maintain the update rules an active communication
structure must be available.

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?

This error message can have two causes.
No active communication structure exists.
Activate the communication structure in the Data Warehousing Workbench.
No communication structure exists for the InfoSource.
Create a communication structure in the Data Warehousing Workbench for
the InfoSource.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message RSAU251 - No communication structure exists in version & for InfoSource & ?

  The SAP error message RSAU251 indicates that there is no communication structure available for a specific version and InfoSource in the context of SAP BW (Business Warehouse) data extraction. This error typically arises when trying to extract data from a source system, and it can be caused by several factors.
  Cause:
  
  Missing Communication Structure: The communication structure for the specified InfoSource has not been created or activated. This structure is essential for data extraction.
  Version Mismatch: The version specified in the error message may not correspond to an existing or valid version in the system.
  InfoSource Configuration: The InfoSource may not be properly configured or may not have been set up to work with the specified version.
  Transport Issues: If the InfoSource or its communication structure was recently transported from another system, it may not have been activated correctly.
  
  Solution:
  
  
  Check Communication Structure:
  
  Go to transaction code RSA1 (Data Warehousing Workbench).
  Navigate to the InfoSource in question and check if the communication structure exists.
  If it does not exist, you may need to create it. This can typically be done by going to the InfoSource and selecting the option to create or generate the communication structure.
  
  
  
  Activate the Communication Structure:
  
  If the communication structure exists but is not activated, activate it. You can do this in the same area where you check for its existence.
  
  
  
  Verify Version:
  
  Ensure that the version specified in the error message is correct and corresponds to an existing version in the system. You can check the version settings in the InfoSource configuration.
  
  
  
  Reconfigure InfoSource:
  
  If the InfoSource is not configured correctly, you may need to reconfigure it. This includes checking the data source settings and ensuring that all necessary fields and mappings are correctly set up.
  
  
  
  Transport Check:
  
  If the InfoSource was recently transported, ensure that all necessary objects were transported and activated in the target system.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or notes related to the specific InfoSource and communication structure for any additional configuration steps or requirements.
  
  
  
  Related Information:
  
  Transaction Codes: 
  
  RSA1: Data Warehousing Workbench
  RSD1: InfoObject Maintenance
  RSMO: Monitor Data Transfer
  
  
  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 for insights from other users who may have encountered similar issues.
  
  By following these steps, you should be able to resolve the RSAU251 error and ensure that the communication structure for the specified InfoSource is correctly set up and activated.