How To Fix WP405 - Material group & cannot be converted

SAP Error Message - Details

• Message type: E = Error

• Message class: WP - Messages from POS interface

• Message number: 405

• Message text: Material group & cannot be converted

What causes this issue?

The conversion rule for material group &V1& is unknown.

System Response

The relevant record cannot be prepared in POS - interface outbound
processing. The relevant document cannot be posted in the SAP system in
POS - interface inbound processing.

How to fix this error?

<DS:SIMG.W_DF_VK_0123.SIMG_OPOS>Define a conversion rule for the
material group </>.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WP405 - Material group & cannot be converted ?

  The SAP error message WP405: "Material group & cannot be converted" typically occurs during data conversion or migration processes, such as when using LSMW (Legacy System Migration Workbench), BAPIs, or IDocs to create or update material master data.
  
  Cause:
  
  The material group value provided in the input data does not exist or is not valid in the SAP system.
  The system tries to convert the material group code (usually a key or ID) to an internal format or check its existence but fails because the material group is missing or incorrectly maintained.
  This can happen if:
  
  The material group is not created in the system.
  The material group code is mistyped or contains invalid characters.
  The material group is inactive or deleted.
  The conversion routine or mapping for material group is incorrect or missing.
  
  
  
  
  Solution:
  
  
  Check Material Group Master Data:
  
  Go to transaction OMS2 (Material Groups) or SPRO > Logistics General > Material Master > Basic Settings > Material Groups.
  Verify that the material group code used in the input data exists and is active.
  If it does not exist, create the material group with the correct code.
  
  
  
  Validate Input Data:
  
  Ensure the material group field in your input file or data source is correct and matches the SAP material group exactly.
  Check for leading/trailing spaces or invalid characters.
  
  
  
  Check Conversion Rules:
  
  If using LSMW or a custom program, verify the conversion rules or mapping for the material group field.
  Make sure the conversion routine is correctly converting the external material group code to the internal SAP format.
  
  
  
  Transport or Client Issues:
  
  If the material group exists in one client but not in another, ensure the material group is transported or created in the target client.
  
  
  
  Debugging:
  
  If the error persists, debug the conversion program or BAPI to see why the material group cannot be converted.
  Check if the function module or BAPI used for material master creation expects a certain format or value.
  
  
  
  
  Related Information:
  
  Transaction OMS2: Maintain material groups.
  Material Group Field: Usually field MATKL in material master tables (MARA, MARC).
  LSMW: Check field mapping and conversion rules for MATKL.
  BAPI: For example, BAPI_MATERIAL_SAVEDATA requires valid material group.
  SAP Notes: Search SAP OSS notes for WP405 or material group conversion issues.
  Error Message Class: WP4 (Material Master related messages).
  
  
  Summary:
  
  
  
  Aspect
  Details
  
  
  
  
  Error
  WP405 Material group & cannot be converted
  
  
  Cause
  Material group code invalid or missing
  
  
  Solution
  Verify/create material group in OMS2; check input data; correct conversion rules
  
  
  Related Tcodes
  OMS2, LSMW, MM01/MM02 (material master)
  
  
  
  
  If you provide more context (e.g., during which process the error occurs), I can help with more specific guidance.