How To Fix /SAPAPO/ATP851 - Program error in reqmt origin screen: Node and subnode cannot be the same

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/ATP -

• Message number: 851

• Message text: Program error in reqmt origin screen: Node and subnode cannot be the same

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 /SAPAPO/ATP851 - Program error in reqmt origin screen: Node and subnode cannot be the same ?

  The SAP error message /SAPAPO/ATP851 typically occurs in the Advanced Planning and Optimization (APO) module when there is an issue with the configuration of the requirement origin in the system. The specific error message "Node and subnode cannot be the same" indicates that there is a conflict in the hierarchy of nodes and subnodes being used in the planning process.
  Cause:
  
  Hierarchy Configuration: The error usually arises when the same node is being assigned as both a node and a subnode in the requirement origin configuration. This can happen due to incorrect settings in the master data or planning hierarchy.
  Data Integrity Issues: There may be inconsistencies in the data that define the relationships between nodes and subnodes.
  Custom Code or Enhancements: If there are custom developments or enhancements in the system, they might be causing this conflict.
  
  Solution:
  
  
  Check Node and Subnode Configuration:
  
  Go to the configuration settings for the requirement origin in the APO system.
  Ensure that the node and subnode are correctly defined and that they do not point to the same entity.
  
  
  
  Review Master Data:
  
  Check the master data for the nodes and subnodes involved in the planning process.
  Make sure that the hierarchy is correctly set up and that there are no duplicates or incorrect assignments.
  
  
  
  Adjust Planning Hierarchy:
  
  If necessary, adjust the planning hierarchy to ensure that nodes and subnodes are distinct and correctly structured.
  
  
  
  Test Changes:
  
  After making the necessary adjustments, test the changes in a development or quality environment before moving them to production.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or notes related to the specific version of APO you are using for any additional guidance or known issues.
  
  
  
  Contact SAP Support:
  
  If the issue persists after checking the configuration and master data, consider reaching out to SAP support for further assistance.
  
  
  
  Related Information:
  
  Transaction Codes: You may need to use transaction codes like /SAPAPO/ATPL (for ATP checks) or /SAPAPO/SDP94 (for planning book) to analyze the data related to the error.
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide patches or updates.
  Community Forums: Engage with SAP community forums or user groups where similar issues may have been discussed.
  
  By following these steps, you should be able to identify and resolve the cause of the /SAPAPO/ATP851 error in your SAP system.