How To Fix CY645 - GANTT chart: Menu function & not known

SAP Error Message - Details

• Message type: E = Error

• Message class: CY - Capacity Requirements Planning

• Message number: 645

• Message text: GANTT chart: Menu function & not known

What causes this issue?

In the Gantt chart you have either triggered a function from the menu
or selected the appropriate pushbutton. However the function selected
does not exist. There is a program error.

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 report the problem to SAP.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CY645 - GANTT chart: Menu function & not known ?

  The SAP error message CY645, which states "GANTT chart: Menu function & not known," typically occurs when there is an issue with the GANTT chart functionality in the SAP system. This error can arise due to various reasons, including missing authorizations, incorrect configuration, or issues with the specific transaction or function module being called.
  Causes:
  
  Missing Authorization: The user may not have the necessary authorizations to access the GANTT chart functionality.
  Incorrect Configuration: The GANTT chart may not be properly configured in the system, leading to the inability to access certain menu functions.
  System Version Issues: The error may occur if the SAP system version does not support the specific GANTT chart functionality being accessed.
  Custom Development: If there are custom developments or enhancements related to the GANTT chart, they may not be functioning correctly.
  
  Solutions:
  
  
  Check Authorizations:
  
  Ensure that the user has the necessary authorizations to access the GANTT chart. This can be done by checking the user's roles and authorizations in transaction SU53 or PFCG.
  
  
  
  Review Configuration:
  
  Verify the configuration settings related to the GANTT chart in the relevant customizing transactions. Ensure that all necessary settings are in place.
  
  
  
  Check for System Updates:
  
  Ensure that the SAP system is up to date with the latest patches and updates. Sometimes, issues are resolved in newer versions or patches.
  
  
  
  Consult Documentation:
  
  Review the SAP documentation or notes related to the GANTT chart functionality. There may be specific notes addressing known issues or configuration steps.
  
  
  
  Debugging:
  
  If you have access to debugging tools, you can analyze the program or function module that is generating the error to identify the root cause.
  
  
  
  Contact SAP Support:
  
  If the issue persists after checking the above points, consider reaching out to SAP support for assistance. Provide them with the error message details and any relevant context.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as C223 (for GANTT chart display) and C220 (for project planning).
  SAP Notes: Search for SAP Notes related to the GANTT chart and error CY645 in the SAP Support Portal.
  User Forums: Check 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 diagnose and resolve the CY645 error related to the GANTT chart in SAP.