How To Fix /SAPAPO/DC_MSG121 - More than one row definition with node number &1

/SAPAPO/DC_MSG121 - Overview

• Message type: E = Error

• Message class: /SAPAPO/DC_MSG -

• Message number: 121

• Message text: More than one row definition with node number &1

Self-Explanatory Message

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/SAPAPO/DC_MSG121 - Details

• The SAP error message /SAPAPO/DC_MSG121 indicates that there is an issue with the data model in SAP Advanced Planning and Optimization (APO). Specifically, it means that there are multiple row definitions associated with the same node number in the data model, which is not allowed.
  
  Cause:
  The error typically arises due to one of the following reasons:
  
  Duplicate Row Definitions: There are multiple entries in the data model that have the same node number, which can occur due to incorrect configuration or data entry.
  Data Model Corruption: The data model may have become corrupted, leading to inconsistencies in the definitions.
  Transport Issues: If the data model was transported from one system to another, it might have led to duplicate entries.
  
  
  Solution:
  To resolve this error, you can follow these steps:
  
  
  Check Row Definitions:
  
  Go to the relevant transaction in SAP APO (e.g., /SAPAPO/DM for Data Model).
  Review the row definitions associated with the node number mentioned in the error message.
  Identify