How To Fix WTADDI301 - It is not possible to convert SAP unit of measure & to an ISO code

SAP Error Message - Details

• Message type: E = Error

• Message class: WTADDI - Additionals: Messages

• Message number: 301

• Message text: It is not possible to convert SAP unit of measure & to an ISO code

Self-Explanatory Message

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• What is the cause and solution for SAP error message WTADDI301 - It is not possible to convert SAP unit of measure & to an ISO code ?

  SAP Error Message:
  
  WTADDI301 – "It is not possible to convert SAP unit of measure & to an ISO code"
  
  Cause:
  This error occurs when SAP tries to convert a unit of measure (UoM) used in the system to its corresponding ISO unit of measure code, but the system cannot find a valid mapping or conversion for the given SAP UoM.
  Typically, this happens in scenarios involving:
  
  Integration with external systems or interfaces that require ISO standard UoM codes.
  Output processing in Warehouse Management (WM), Transportation Management (TM), or Logistics Execution (LE) where ISO codes are mandatory.
  When using SAP Global Trade Services (GTS) or Advanced Shipping Notification (ASN) processes.
  When the unit of measure is custom or not maintained in the standard conversion tables.
  
  
  Explanation:
  SAP internally uses its own unit of measure codes (e.g., PC for pieces, KG for kilograms). However, for communication with external systems or compliance with international standards, SAP often needs to convert these to ISO 80000-1 standard codes or other standardized codes.
  If the system cannot find a mapping for the SAP UoM to an ISO code, it throws this error.
  
  Solution:
  
  
  Check Unit of Measure Mapping:
  
  Go to transaction CUNI (Units of Measure) or OMWN (Units of Measure: Define Units).
  Verify the unit of measure in question exists and is correctly maintained.
  Check if the ISO code is assigned to the SAP unit of measure.
  
  
  
  Maintain ISO Code for the Unit of Measure:
  
  Use transaction CUNI or OMWN to assign the correct ISO code to the SAP unit of measure.
  In some SAP versions, the ISO code is maintained in the "Additional Data" tab or a specific field for ISO codes.
  If the unit is custom, create or extend the unit of measure and assign the appropriate ISO code.
  
  
  
  Check Conversion Tables:
  
  Sometimes, the conversion is controlled by specific tables or customizing settings.
  Check if any user-exits or BAdIs are involved in the conversion process and ensure they handle the unit correctly.
  
  
  
  Review Integration Settings:
  
  If the error occurs during integration (e.g., EDI, IDoc processing), verify the mapping in the middleware or interface.
  Ensure that the interface expects the correct ISO code and that the SAP side provides it.
  
  
  
  Custom Development:
  
  If standard SAP does not support the required unit or ISO code, consider enhancing the system via user-exits or BAdIs to handle the conversion.
  
  
  
  
  Additional Information:
  
  
  Transaction Codes:
  
  CUNI – Units of Measure
  OMWN – Define Units of Measure
  SPRO – IMG path for Logistics ? General ? Units of Measure
  
  
  
  Relevant Tables:
  
  T006 – Units of Measure
  T006A – Units of Measure: ISO Codes
  
  
  
  Notes and SAP Help:
  
  Check SAP Notes related to unit of measure conversions.
  Review SAP documentation on units of measure and ISO code assignments.
  
  
  
  
  Summary:
  
  
  
  Aspect
  Details
  
  
  
  
  Cause
  Missing or incorrect ISO code assignment for the SAP unit of measure.
  
  
  Effect
  System cannot convert SAP UoM to ISO code, causing error WTADDI301.
  
  
  Solution
  Maintain or correct the ISO code for the unit of measure in transaction CUNI or OMWN.
  
  
  Additional
  Verify integration mappings and consider custom enhancements if needed.
  
  
  
  
  If you provide the specific unit of measure causing the error, I can help you identify the correct ISO code or guide you through the exact steps to fix it.