How To Fix WG055 - Unit & sent is not ISO unit or cannot be converted to a SAP unit

SAP Error Message - Details

• Message type: E = Error

• Message class: WG - Messages for store order and investment buy

• Message number: 055

• Message text: Unit & sent is not ISO unit or cannot be converted to a SAP unit

What causes this issue?

The unit of measure &V1& sent is not an ISO unit of measure. Therefore
it cannot be converted into the SAP unit of measure.
No corresponding entry is entered in the conversion table.

System Response

The GR quantity unit is forwarded unconverted.

How to fix this error?

Maintain the unit of measurement table if you want a conversion or
send the correct units of measure.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WG055 - Unit & sent is not ISO unit or cannot be converted to a SAP unit ?

  The SAP error message:
  WG055: Unit & sent is not ISO unit or cannot be converted to a SAP unit
  
  Cause:
  This error occurs when the system encounters a unit of measure (UoM) in a document or transaction that is either:
  
  Not an ISO standard unit of measure, and
  Cannot be converted or mapped to any unit of measure defined in SAP.
  
  Typically, this happens during goods receipt, goods issue, or when processing delivery or purchase order documents where the unit of measure sent from an external system or entered manually is not recognized or convertible by SAP.
  
  Explanation:
  
  SAP uses ISO units of measure as a standard reference.
  If a unit is not ISO or not maintained in the system, SAP cannot perform quantity conversions or validations.
  The system expects the unit to be either an ISO unit or a unit that can be converted to an ISO unit via unit conversion factors maintained in SAP.
  
  
  Common Scenarios:
  
  Integration with external systems (e.g., EDI, IDoc) where the unit of measure sent is not maintained in SAP.
  Manual entry of a unit of measure that is not defined in SAP.
  Master data inconsistencies where the unit of measure is missing or incorrectly maintained.
  Missing or incorrect unit of measure conversion factors in SAP.
  
  
  Solution:
  
  
  Check the Unit of Measure:
  
  Verify the unit of measure causing the error.
  Check if it is defined in SAP transaction CUNI (Units of Measure).
  
  
  
  Maintain the Unit of Measure:
  
  If the unit is missing, create it in CUNI.
  Ensure the unit is flagged as an ISO unit or has a valid conversion factor to an ISO unit.
  
  
  
  Maintain Conversion Factors:
  
  In CUNI, maintain conversion factors between the problematic unit and a base ISO unit.
  This allows SAP to convert quantities correctly.
  
  
  
  Check Master Data:
  
  Verify material master data (transaction MM03) for the base unit of measure and alternative units.
  Ensure the units used in transactions are consistent with material master data.
  
  
  
  Check Integration Settings:
  
  If the unit comes from an external system (e.g., EDI), ensure the mapping of units is correct.
  Adjust the interface or IDoc mapping to send valid units.
  
  
  
  Test the Correction:
  
  After maintaining the unit and conversion factors, retry the transaction.
  
  
  
  
  Related Transactions and Tables:
  
  CUNI – Units of Measure maintenance
  MM03 – Display Material Master (check units of measure)
  OMWN – Define Units of Measure (for customizing)
  T006 – Table for Units of Measure
  IDoc / EDI Mapping – Check unit mapping in interfaces
  
  
  Summary:
  
  The error WG055 indicates SAP cannot recognize or convert the unit of measure.
  The fix involves defining the unit in SAP and ensuring proper conversion factors exist.
  Always ensure units used in transactions are consistent with SAP master data and ISO standards.
  
  
  If you need further help, please provide the exact unit of measure causing the error and the transaction context.