How To Fix CN159 - Enter material number

SAP Error Message - Details

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 159

• Message text: Enter material number

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message CN159 - Enter material number ?

  The SAP error message CN159 "Enter material number" typically occurs in the context of project management or production planning when a user attempts to perform an action that requires a material number, but none has been provided. This error is common in transactions related to network activities, cost planning, or material requirements planning.
  Cause:
  
  Missing Material Number: The most straightforward cause is that the user has not entered a material number in the relevant field.
  Incorrect Transaction: The user may be in a transaction that requires a material number but is not in the correct context to provide one.
  Configuration Issues: There may be configuration settings in the SAP system that require a material number for certain operations, and these settings may not be aligned with the user's actions.
  User Input Error: The user may have overlooked the field or made a mistake while entering data.
  
  Solution:
  
  Enter Material Number: The immediate solution is to ensure that a valid material number is entered in the required field. Check if the material number exists in the system.
  Check Transaction Context: Ensure that you are in the correct transaction that requires a material number. If you are unsure, refer to the transaction documentation or help resources.
  Review Configuration: If you believe the error is due to configuration, consult with your SAP administrator or a functional consultant to review the settings related to the transaction you are using.
  Validate Material Master Data: Ensure that the material number you are trying to enter is valid and exists in the material master. You can check this using transaction MM03 (Display Material).
  User Training: If this error occurs frequently, consider providing additional training to users on the importance of entering material numbers and how to navigate the relevant transactions.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with the relevant transaction codes that may require material numbers, such as CN21 (Create Work Breakdown Structure), CN22 (Change Work Breakdown Structure), or CN41 (Display Project).
  Material Master: Understanding the material master data structure and how materials are classified can help in troubleshooting this error.
  SAP Documentation: Refer to SAP Help Portal or your organization's SAP documentation for specific guidelines related to the transactions you are using.
  
  If the problem persists after trying the above solutions, it may be beneficial to reach out to your SAP support team for further assistance.