How To Fix S~101 - On node & (typ &) exists a loop

S~101 - Overview

• Message type: E = Error

• Message class: S~ - Repository API Business Navigator

• Message number: 101

• Message text: On node & (typ &) exists a loop

What causes this issue?

It exits a line, where the predecessor node is also the successor node.

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?

You have to correct the line definition in your model.

Error message extract from SAP system. Copyright SAP SE.

S~101 - Details

• The SAP error message "S~101 On node & (typ &) exists a loop" typically indicates that there is a circular reference or loop in the configuration of a hierarchical structure, such as a bill of materials (BOM), routing, or other master data structures. This error can occur in various contexts, including when defining relationships between objects in SAP.
  
  Cause:
  
  Circular Reference: The most common cause of this error is a circular reference where a node in a hierarchy points back to itself, either directly or indirectly. For example, if node A points to node B, and node B points back to node A, this creates a loop.
  Incorrect Configuration: Misconfiguration in the master data setup, such as BOMs, routings, or other hierarchical structures, can lead to this error.
  Data Integrity Issues: Data inconsistencies or corruption in the database can also lead to this error.
  
  
  Solution:
  
  
  Identify the Loop: 
  
  Use transaction codes like CS03 (Display BOM) or