How To Fix S~021 - There is already a component &1 that refers on component &2

S~021 - Overview

• Message type: E = Error

• Message class: S~ - Repository API Business Navigator

• Message number: 021

• Message text: There is already a component &1 that refers on component &2

What causes this issue?

To insert a customer model you tried to insert a new component refering
to an SAP component. But the component is already refered by an
existing component.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Use the existing component to add your model.

Error message extract from SAP system. Copyright SAP SE.

S~021 - Details

• The SAP error message S~021, which states "There is already a component &1 that refers to component &2," typically occurs in the context of SAP's component management, particularly when dealing with the assignment of components in a structure or hierarchy. This error indicates that there is an attempt to create a reference or assignment that already exists, leading to a conflict.
  
  Cause:
  
  Duplicate Assignment: The error is often caused by trying to assign a component (e.g., a material, service, or other object) to another component when that assignment already exists in the system.
  Data Integrity Issues: There may be inconsistencies in the data, such as multiple entries for the same component or incorrect references.
  Configuration Errors: In some cases, the error may arise from incorrect configuration settings in the system that allow for duplicate entries.
  
  
  Solution:
  
  Check Existing Assignments: Review the existing components and their assignments to identify if the component you are trying to add