How To Fix RSAU178 - Communication structure & does not exist

SAP Error Message - Details

• Message type: E = Error

• Message class: RSAU - Update rules

• Message number: 178

• Message text: Communication structure & does not exist

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message RSAU178 - Communication structure & does not exist ?

  The SAP error message RSAU178 indicates that a communication structure required for a specific operation does not exist. This error typically arises in the context of SAP's data extraction processes, particularly when dealing with the SAP BW (Business Warehouse) or SAP BI (Business Intelligence) systems.
  Cause:
  
  Missing Communication Structure: The primary cause of this error is that the communication structure (often a DataSource or InfoSource) that the system is trying to access has not been created or is not activated.
  Incorrect Configuration: There may be a misconfiguration in the DataSource settings or the extraction process.
  Transport Issues: If the communication structure was recently transported from another system, it may not have been properly activated in the target system.
  Version Mismatch: The version of the DataSource or InfoSource may not match the version expected by the system.
  
  Solution:
  
  
  Check Communication Structure: 
  
  Go to the DataSource or InfoSource in the SAP system and verify if the communication structure exists.
  Use transaction code RSA1 to access the Data Warehousing Workbench and check the DataSource settings.
  
  
  
  Activate the Communication Structure:
  
  If the communication structure is missing, you may need to create it or activate it. This can typically be done in the DataSource settings.
  Use transaction code RSA2 to check and activate the DataSource.
  
  
  
  Reconfigure DataSource:
  
  If the DataSource is incorrectly configured, you may need to reconfigure it. Ensure that all necessary fields and settings are correctly defined.
  
  
  
  Transport Requests:
  
  If the issue arose after a transport, check the transport logs to ensure that all objects were transported correctly. You may need to re-transport the missing objects.
  
  
  
  Check for Updates:
  
  Ensure that your SAP system is up to date with the latest patches and updates, as sometimes bugs in earlier versions can lead to such errors.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or notes related to the specific DataSource or InfoSource for any known issues or additional configuration steps.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  RSA1: Data Warehousing Workbench
  RSA2: DataSource Maintenance
  SE11: Data Dictionary (to check the structure)
  
  
  
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address this specific error or provide additional troubleshooting steps.
  
  
  Community Forums: Consider checking SAP Community forums or other user groups for similar issues and solutions shared by other users.
  
  
  By following these steps, you should be able to identify the cause of the RSAU178 error and implement the necessary solutions to resolve it.