How To Fix RD251 - Catch-loop in logical system &1 deactivated

SAP Error Message - Details

• Message type: E = Error

• Message class: RD - CO-PA Connection to SAP BW

• Message number: 251

• Message text: Catch-loop in logical system &1 deactivated

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message RD251 - Catch-loop in logical system &1 deactivated ?

  The SAP error message RD251, which states "Catch-loop in logical system &1 deactivated," typically occurs in the context of SAP's Remote Function Call (RFC) and the distribution of data between different systems in a landscape. This error indicates that there is a catch-loop detected in the logical system specified, which means that the system is trying to send data to itself, leading to an infinite loop.
  Cause:
  
  Incorrect Configuration: The logical system may be incorrectly configured, causing it to send messages to itself.
  Circular Dependencies: There may be circular dependencies in the configuration of the systems, where one system is set to send data to another, which in turn is set to send data back to the first system.
  Transport Routes: The transport routes may not be set up correctly, leading to a situation where the system thinks it needs to send data to itself.
  
  Solution:
  
  
  Check Logical System Configuration:
  
  Go to transaction SM59 and check the RFC destinations. Ensure that the logical system is not pointing to itself.
  Verify the configuration in transaction BD54 (Logical System) to ensure that the logical system is correctly defined.
  
  
  
  Review Distribution Model:
  
  Use transaction BD64 to check the distribution model. Ensure that the logical system is not included in a way that would cause it to send data to itself.
  
  
  
  Check Transport Routes:
  
  Review the transport routes in transaction STMS to ensure that there are no circular routes defined.
  
  
  
  Adjust Settings:
  
  If you find that the logical system is incorrectly configured, adjust the settings to ensure that it points to the correct logical system and does not create a loop.
  
  
  
  Testing:
  
  After making changes, test the configuration by triggering the data distribution again to ensure that the error does not occur.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SM59: RFC Destinations
  BD54: Maintain Logical Systems
  BD64: Maintain Distribution Model
  STMS: Transport Management System
  
  
  
  Documentation: Refer to SAP Help documentation for more details on configuring logical systems and distribution models.
  
  
  SAP Notes: Check for any relevant SAP Notes that may address specific issues related to this error message.
  
  
  By following these steps, you should be able to resolve the RD251 error and ensure that your SAP systems communicate correctly without entering a catch-loop.