How To Fix CN901 -

SAP Error Message - Details

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 901

• Message text:

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.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message CN901 - ?

  The SAP error message CN901 typically relates to issues in the Project System (PS) module, particularly when dealing with network activities or project planning. The error message CN901 usually indicates that there is a problem with the assignment of a work center or a resource to a network activity.
  Cause:
  The CN901 error can occur due to several reasons, including:
  
  Invalid Work Center: The work center assigned to the activity may not be valid or may not exist in the system.
  Resource Availability: The resource assigned to the work center may not be available or may not be correctly defined.
  Incorrect Configuration: There may be configuration issues in the project or network settings that prevent the assignment from being processed correctly.
  Missing Master Data: Required master data (like work centers, resources, or cost elements) may be missing or incorrectly set up.
  
  Solution:
  To resolve the CN901 error, you can take the following steps:
  
  Check Work Center: Verify that the work center assigned to the network activity is valid and exists in the system. You can do this by navigating to the work center master data in SAP.
  Review Resource Assignment: Ensure that the resources assigned to the work center are correctly defined and available for the planned dates.
  Validate Configuration: Check the configuration settings for the project and network to ensure they are set up correctly.
  Master Data Review: Ensure that all necessary master data is in place and correctly configured. This includes checking for any missing or incorrect entries in the work center, resource, or cost element master data.
  Consult Documentation: Refer to SAP documentation or help resources for specific details related to the CN901 error and its context within your project.
  
  Related Information:
  
  Transaction Codes: You may need to use transaction codes like CJ20N (Project Builder) or CN22 (Change Network) to investigate and make changes to the project or network activities.
  SAP Notes: Check for any relevant SAP Notes that may address known issues or provide patches related to the CN901 error.
  User Authorization: Ensure that you have the necessary authorizations to make changes to the project or network settings.
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP support team or a functional consultant who specializes in the Project System module.