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

/SAPAPO/ATP851 - Overview

• 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.

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/SAPAPO/ATP851 - Details

• 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