How To Fix CY689 - Communication error occurred in the planning table.

SAP Error Message - Details

• Message type: E = Error

• Message class: CY - Capacity Requirements Planning

• Message number: 689

• Message text: Communication error occurred in the planning table.

What causes this issue?

An error has arisen in the communication between the program and the
planning table.

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?

You should contact your system administrator. You can may be able to
find the direct cause in the syslog.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CY689 - Communication error occurred in the planning table. ?

  The SAP error message CY689, which states "Communication error occurred in the planning table," typically indicates an issue with the communication between the SAP system and the planning table interface. This can occur in various scenarios, such as during the execution of planning functions or when trying to access planning tables in SAP APO (Advanced Planning and Optimization) or other modules.
  Causes:
  
  Network Issues: There may be network connectivity problems between the SAP application server and the client or between different SAP systems.
  Session Timeout: The session may have timed out due to inactivity, leading to a communication breakdown.
  Configuration Issues: Incorrect configuration settings in the planning table or in the SAP system can lead to communication errors.
  System Performance: High system load or performance issues can cause delays or failures in communication.
  Authorization Issues: Lack of proper authorizations for accessing the planning table can also trigger this error.
  Software Bugs: There may be bugs in the SAP software that lead to communication errors.
  
  Solutions:
  
  Check Network Connectivity: Ensure that there are no network issues affecting communication. You can test connectivity using tools like ping or traceroute.
  Session Management: If the session has timed out, try logging out and logging back into the SAP system.
  Review Configuration: Check the configuration settings for the planning table and ensure they are set up correctly.
  Monitor System Performance: Use transaction codes like ST03N or SM66 to monitor system performance and identify any bottlenecks.
  Check Authorizations: Verify that the user has the necessary authorizations to access the planning table.
  Update SAP Software: If the issue persists, check for any available patches or updates from SAP that may address known bugs.
  Consult SAP Notes: Look for relevant SAP Notes in the SAP Support Portal that may provide specific guidance or fixes for this error.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as /SAPAPO/MC90 for planning table access and SM21 for system logs.
  SAP Support: If the issue cannot be resolved internally, consider reaching out to SAP Support for assistance.
  Documentation: Review SAP documentation related to planning tables and communication errors for additional insights.
  
  By following these steps, you should be able to diagnose and resolve the CY689 error in your SAP environment.