How To Fix /SCMTMS/MC_CON_CACHE166 - &1 entries without connection key

SAP Error Message - Details

• Message type: E = Error

• Message class: /SCMTMS/MC_CON_CACHE -

• Message number: 166

• Message text: &1 entries without connection key

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SCMTMS/MC_CON_CACHE166 - &1 entries without connection key ?

  The SAP error message /SCMTMS/MC_CON_CACHE166 typically indicates that there are entries in the connection cache that do not have a valid connection key. This can occur in the context of SAP Transportation Management (TM) when the system is trying to access or process transportation connections, but some entries are missing necessary identifiers.
  Cause:
  
  Data Inconsistency: The entries in the connection cache may have been created or modified incorrectly, leading to missing or invalid connection keys.
  System Upgrade or Migration: If the system has recently undergone an upgrade or migration, there may be inconsistencies in the data that were not resolved during the process.
  Custom Development: Custom code or enhancements may have inadvertently created entries without proper connection keys.
  Transport Requests: Issues with transport requests that did not properly include all necessary data can lead to this error.
  
  Solution:
  
  Check Connection Cache: Use transaction /SCMTMS/MC_CON_CACHE to review the connection cache entries. Identify the entries that are missing connection keys.
  Delete Invalid Entries: If you find entries without connection keys, you may need to delete them from the cache. This can often be done directly in the cache management transaction.
  Recreate Connections: If necessary, recreate the connections that are missing keys to ensure that they are properly configured.
  Data Consistency Check: Run consistency checks in the TM system to identify and resolve any other data inconsistencies that may be present.
  Review Custom Code: If custom developments are involved, review the code to ensure that it is correctly handling connection keys.
  System Logs: Check system logs for any additional error messages or warnings that may provide more context about the issue.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. SAP frequently releases updates that address specific bugs or issues.
  Documentation: Review the SAP TM documentation for best practices on managing connections and cache entries.
  Support: If the issue persists, consider reaching out to SAP Support for assistance, especially if it is impacting business processes.
  
  By following these steps, you should be able to identify the root cause of the error and implement a solution to resolve it.