How To Fix CL550 - Class type &: class & causes BOMs to be recursive

SAP Error Message - Details

• Message type: E = Error

• Message class: CL - Classification

• Message number: 550

• Message text: Class type &: class & causes BOMs to be recursive

What causes this issue?

Class &V2& of class type &V1& is used as a class item in BOM &V3&.
This class contains materials either directly or via subordinate
<DS:GLOS.class_hierarchy>hierarchy levels</>. One of these materials is
the material for which BOM &V3& has been created. This BOM will become
<DS:GLOS.recursiveness>recursive</> if you replace the class item with
the material. This is not currently allowed.

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?

Change BOM &V3&. On the item screen for class item &V2&, define
recursiveness as allowed.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CL550 - Class type &: class & causes BOMs to be recursive ?

  The SAP error message CL550 indicates that there is a recursive relationship in the Bill of Materials (BOM) for a class type. This typically occurs when a BOM references itself directly or indirectly, leading to an infinite loop in the structure. Here’s a breakdown of the cause, potential solutions, and related information:
  Cause:
  
  Self-Referencing BOM: A BOM may directly reference itself, which creates a recursive loop.
  Indirect Reference: A BOM may reference another BOM that eventually references the original BOM, creating an indirect recursive relationship.
  Incorrect Configuration: Errors in the configuration of the BOM or class type settings can lead to recursive definitions.
  
  Solution:
  
  Review BOM Structure: Check the BOM for the class type indicated in the error message. Look for any direct or indirect references that may cause recursion.
  Correct References: If you find a self-referencing BOM, modify it to remove the reference. Ensure that the BOM structure is logical and does not loop back on itself.
  Use Transaction Codes: Utilize transaction codes like CS03 (Display BOM) or CS02 (Change BOM) to analyze and modify the BOM structure.
  Check Class Type Configuration: Review the configuration of the class type in transaction CL02 (Change Class) to ensure that it is set up correctly and does not inadvertently create recursive relationships.
  Testing: After making changes, test the BOM to ensure that the error no longer occurs and that the BOM functions as intended.
  
  Related Information:
  
  BOM Structure: Understanding how BOMs are structured in SAP is crucial. BOMs can be multi-level, and each level should be carefully defined to avoid recursion.
  Class Types: Class types in SAP are used to categorize materials and can have specific characteristics. Ensure that the class type settings align with the intended BOM structure.
  Documentation: Refer to SAP documentation or help files for detailed guidance on BOM management and class types.
  SAP Notes: Check for any relevant SAP Notes that may address known issues or provide additional guidance on handling BOM recursion.
  
  By following these steps, you should be able to identify and resolve the recursive BOM issue indicated by the CL550 error message.