How To Fix LK002 - No definition of communication relationship for message type &

SAP Error Message - Details

• Message type: E = Error

• Message class: LK - WM -> SUB connection messages

• Message number: 002

• Message text: No definition of communication relationship for message type &

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message LK002 - No definition of communication relationship for message type & ?

  The SAP error message LK002 indicates that there is no definition of a communication relationship for the specified message type. This error typically occurs in the context of Electronic Data Interchange (EDI) or when dealing with IDocs (Intermediate Documents) in SAP.
  Cause:
  The error can arise due to several reasons:
  
  Missing Communication Relationship: The communication relationship for the specified message type has not been defined in the system.
  Incorrect Configuration: The configuration settings for the message type or the partner profile may be incorrect or incomplete.
  Partner Profile Issues: The partner profile for the sender or receiver may not be set up correctly, or the message type may not be included in the profile.
  Message Type Not Supported: The message type being used may not be supported or recognized by the system.
  
  Solution:
  To resolve the LK002 error, you can follow these steps:
  
  
  Check Communication Relationships:
  
  Go to transaction code WE20 (Partner Profiles).
  Verify that the partner profile for the relevant partner (sender/receiver) includes the correct message type.
  Ensure that the communication method (e.g., EDI, ALE) is correctly configured.
  
  
  
  Define Communication Relationships:
  
  If the communication relationship is missing, you need to create it.
  In transaction WE20, select the appropriate partner type (e.g., Logical System, External System) and create or modify the partner profile.
  Add the necessary message type under the relevant section (e.g., Outbound Parameters for the sender).
  
  
  
  Check Message Type Configuration:
  
  Use transaction WE81 to check if the message type is defined correctly.
  Ensure that the message type is linked to the correct IDoc type.
  
  
  
  Review IDoc Settings:
  
  Use transaction WE30 to check the IDoc type associated with the message type.
  Ensure that the IDoc type is correctly configured and that all necessary segments are defined.
  
  
  
  Testing:
  
  After making the necessary changes, test the communication by triggering the process that generates the IDoc or EDI message again.
  
  
  
  Consult Documentation:
  
  If you are unsure about the configurations, refer to SAP documentation or consult with your SAP Basis or EDI team for assistance.
  
  
  
  Related Information:
  
  Transaction Codes:
  
  WE20: Partner Profiles
  WE30: IDoc Types
  WE81: Message Types
  
  
  Common Message Types: Familiarize yourself with common message types used in your business processes (e.g., ORDERS, INVOIC).
  SAP Notes: Check SAP Notes for any known issues or updates related to the LK002 error.
  
  By following these steps, you should be able to identify and resolve the cause of the LK002 error in your SAP system.