How To Fix WTADDI428 - Class type &1 and class &2 cannot be exploded

SAP Error Message - Details

• Message type: E = Error

• Message class: WTADDI - Additionals: Messages

• Message number: 428

• Message text: Class type &1 and class &2 cannot be exploded

What causes this issue?

You wish to specify plants or customers using class &V2&. The system is
unable to explode this class, however, as there are no plants or
customers assigned to it.

How to fix this error?

Check whether class &V2& really does belong to class type &V1&; if not,
correct your entries.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WTADDI428 - Class type &1 and class &2 cannot be exploded ?

  Certainly! Here's a detailed explanation for the SAP error message WTADDI428: Class type &1 and class &2 cannot be exploded:
  
  Error Message
  WTADDI428: Class type &1 and class &2 cannot be exploded
  
  Cause
  This error occurs during the explosion of a class in SAP, typically in the context of Work Breakdown Structure (WBS) or Class-based BOM (Bill of Materials) processing. The system tries to explode (break down) a class into its components or sub-classes, but it encounters two class types that are incompatible for explosion.
  
  Class explosion means breaking down a class into its components or sub-classes.
  The error indicates that the system cannot explode a class of type &1 together with a class of type &2.
  This usually happens because the class types involved are not designed to be exploded together or the system does not support explosion for one or both class types.
  
  Common scenarios:
  
  Trying to explode a material class together with a document class or other non-explodable class types.
  Class types that are not configured for explosion in the system.
  Incorrect assignment or usage of class types in BOM or WBS structures.
  
  
  Solution
  
  
  Check Class Types:
  
  Identify the class types &1 and &2 mentioned in the error.
  Use transaction CL02 or CL03 to display the classes and verify their types.
  
  
  
  Review Explosion Settings:
  
  Verify if the class types involved are allowed to be exploded.
  Some class types are not designed for explosion (e.g., document classes, inspection classes).
  Check the configuration in SPRO under:
  Logistics General -> Classification System -> Classes -> Define Class Types
  to understand the properties of the class types.
  
  
  
  
  Adjust Class Usage:
  
  If you are trying to explode incompatible class types together, separate them.
  Use only explodable class types in BOM or WBS explosion processes.
  
  
  
  Check BOM and WBS Configuration:
  
  Ensure that the BOM or WBS elements are assigned correct class types.
  If the explosion is triggered via a BOM, verify the BOM items and their class assignments.
  
  
  
  Consult SAP Notes:
  
  Search for SAP Notes related to WTADDI428 for any patches or known issues.
  Sometimes, specific SAP releases have bugs fixed via Notes.
  
  
  
  Custom Development or User Exits:
  
  If custom code or user exits are involved in the explosion process, verify that they handle class types correctly.
  
  
  
  
  Related Information
  
  
  Transaction Codes:
  
  CL02 - Change Class
  CL03 - Display Class
  CS03 - Display BOM
  CJ20N - Project Builder (for WBS elements)
  
  
  
  SAP Modules:
  
  Classification System (LO-CL)
  Plant Maintenance (PM)
  Project System (PS)
  Production Planning (PP)
  
  
  
  SAP Notes:
  
  Check SAP Support Portal for notes related to WTADDI428 or class explosion issues.
  
  
  
  Documentation:
  
  SAP Help Portal on Classification System and BOM explosion.
  SAP Library on Class Types and their properties.
  
  
  
  
  Summary
  
  
  
  Aspect
  Details
  
  
  
  
  Cause
  Attempt to explode incompatible class types &1 and &2 which cannot be exploded together.
  
  
  Solution
  Verify class types, ensure only explodable class types are used, adjust BOM/WBS assignments, check configuration and SAP Notes.
  
  
  Related
  Transactions CL02, CL03, CS03, CJ20N; Classification System configuration; SAP Notes.
  
  
  
  
  If you provide the actual class types (&1 and &2), I can help you with more specific advice.