How To Fix KK166 - Cyclic structures cannot be costed

SAP Error Message - Details

• Message type: E = Error

• Message class: KK -

• Message number: 166

• Message text: Cyclic structures cannot be costed

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message KK166 - Cyclic structures cannot be costed ?

  The SAP error message KK166, "Cyclic structures cannot be costed," typically occurs in the context of product costing when the system detects a cyclic dependency in the cost structure of a material or product. This means that the cost calculation process has encountered a loop in the bill of materials (BOM) or routing, which prevents it from determining the costs accurately.
  Cause:
  
  Cyclic Dependencies: The most common cause of this error is a cyclic reference in the BOM or routing. For example, if material A is dependent on material B for its cost, and material B is also dependent on material A, this creates a cycle that the costing process cannot resolve.
  Incorrect BOM/Routing Configuration: Errors in the configuration of the BOM or routing, such as incorrect component assignments or missing components, can lead to cyclic structures.
  Changes in BOM/Routing: Recent changes to the BOM or routing that have not been properly validated can introduce cycles.
  
  Solution:
  
  Review BOM and Routing: Check the BOM and routing for the material in question. Look for any circular references where one component depends on another in a way that creates a loop.
  Correct Dependencies: If you find cyclic dependencies, you will need to correct them. This may involve reassigning components, removing unnecessary dependencies, or restructuring the BOM/routing.
  Use the BOM/Routing Check Tools: SAP provides tools to check the integrity of BOMs and routings. Use transaction codes like CS02 (Change BOM) or CA02 (Change Routing) to analyze and validate the structure.
  Costing Run: After making corrections, attempt to run the costing again to see if the error persists.
  Consult Documentation: Refer to SAP documentation or help resources for specific guidelines on resolving cyclic structures in your version of SAP.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CS01 (Create BOM), CS02 (Change BOM), CS03 (Display BOM), CA01 (Create Routing), CA02 (Change Routing), and CA03 (Display Routing).
  Costing Variants: Ensure that the costing variant being used is correctly configured and does not have settings that could contribute to the issue.
  SAP Notes: Check for any SAP Notes related to this error message, as they may provide additional insights or patches that could resolve the issue.
  Testing: After making changes, it is advisable to test the costing in a development or quality environment before applying changes to the production environment.
  
  By following these steps, you should be able to identify and resolve the cyclic structure issue that is causing the KK166 error in SAP.