How To Fix CN075 - External processing required as purchase order exists

SAP Error Message - Details

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 075

• Message text: External processing required as purchase order exists

What causes this issue?

You are attempting to change the control key of an externally processed
activity. When you change the control key, the activity can no longer
be processed externally. Since there is already a purchase order for
this activity, the control key of the activity must allow
external processing.

System Response

INCLUDE 'NA_ALLG_NOVERARBEITUNG' OBJECT DOKU ID TX

How to fix this error?

Select a control key which allows external processing.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CN075 - External processing required as purchase order exists ?

  The SAP error message CN075 ("External processing required as purchase order exists") typically occurs in the context of project management and procurement processes within SAP. This error indicates that there is a purchase order (PO) associated with a project or network activity, and the system is preventing certain actions because of this association.
  Cause:
  
  Existing Purchase Order: The primary cause of this error is that there is an existing purchase order linked to the project or network activity you are trying to process. The system requires that any changes or actions that could affect the purchase order must be handled externally or through the appropriate procurement processes.
  Project Structure: The project structure may have dependencies that are tied to the purchase order, which restricts certain operations until the purchase order is resolved or processed.
  Configuration Settings: There may be specific configuration settings in the SAP system that enforce this behavior, particularly in project systems (PS) or controlling (CO) modules.
  
  Solution:
  
  Review Purchase Orders: Check the purchase orders associated with the project or network activity. You can do this by navigating to the relevant transaction codes (e.g., ME23N for display purchase order) and verifying the details.
  Process the Purchase Order: If the purchase order is still valid and needs to be processed, ensure that it is completed or closed as necessary. This may involve receiving goods, making payments, or completing any outstanding tasks related to the PO.
  Adjust Project Activities: If you need to make changes to the project or network activity, consider whether those changes can be made without affecting the purchase order. If necessary, consult with your project manager or procurement team.
  Consult Documentation: Review SAP documentation or help resources for specific guidance on handling purchase orders in relation to project activities.
  Contact Support: If the issue persists and you cannot determine the cause, consider reaching out to your SAP support team or consulting with an SAP expert for further assistance.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as ME23N (Display Purchase Order), CN21 (Create Work Breakdown Structure), and CN22 (Change Work Breakdown Structure).
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. SAP Notes can provide additional context or solutions for specific scenarios.
  User Roles and Authorizations: Ensure that you have the necessary authorizations to perform the actions you are attempting. Sometimes, restrictions can be due to user role limitations.
  
  By following these steps, you should be able to address the CN075 error and proceed with your project management or procurement activities in SAP.