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

CY645 - Overview

• 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.

CY645 - Details

• 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