How To Fix WES_OUTBOUND109 - Unit of measure &1 for material &2 could not be converted to UM &3

SAP Error Message - Details

• Message type: E = Error

• Message class: WES_OUTBOUND - Messages for Outbound Services

• Message number: 109

• Message text: Unit of measure &1 for material &2 could not be converted to UM &3

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WES_OUTBOUND109 - Unit of measure &1 for material &2 could not be converted to UM &3 ?

  Certainly! Here's a detailed explanation for the SAP error message:
  
  SAP Error Message:
  WES_OUTBOUND109 Unit of measure &1 for material &2 could not be converted to UM &3
  
  Meaning / Cause:
  This error occurs when SAP tries to convert a quantity from one unit of measure (UoM) to another for a specific material, but the conversion is not possible because the system does not have the necessary conversion factor or the units are incompatible.
  
  &1 = Source unit of measure (the UoM you are trying to convert from)  
  &2 = Material number  
  &3 = Target unit of measure (the UoM you want to convert to)
  
  The system attempts to convert the quantity from unit &1 to unit &3 for material &2 but fails because the conversion factor is missing or incorrectly maintained.
  
  Common Causes:
  
  
  Missing or incorrect unit of measure conversion in material master:
  
  The material master does not have a valid conversion factor between the two units of measure.
  
  
  Units of measure are incompatible:
  
  For example, trying to convert a weight unit (kg) to a length unit (m) without a valid conversion.
  
  
  Customizing or master data inconsistency:
  
  The units of measure might not be properly defined or linked in the system.
  
  
  Data issues in outbound processing:
  
  The outbound process (e.g., delivery, shipping, or EDI outbound) tries to convert units but fails due to missing data.
  
  
  
  Solution / How to Fix:
  
  
  Check and maintain unit of measure conversions in the material master:
  
  Go to transaction MM02 (Change Material Master).
  Enter the material number (&2).
  Navigate to the Additional Data tab or Units of Measure tab (depending on SAP version).
  Check the Alternative Units of Measure and ensure that the conversion factor between &1 and &3 is maintained correctly.
  If missing, add the conversion factor (e.g., 1 box = 10 pieces).
  
  
  
  Verify units of measure definitions:
  
  Use transaction CUNI to check the units of measure and their categories.
  Ensure that the units &1 and &3 are compatible (e.g., both are units of quantity, weight, or volume).
  
  
  
  Check customizing for units of measure:
  
  Use transaction SPRO ? Logistics General ? Units of Measure ? Check Units of Measure.
  Verify that the units are properly defined and active.
  
  
  
  Review the outbound process or interface:
  
  If this error occurs during an outbound process (e.g., delivery, shipping, or EDI), check the configuration or mapping of units of measure.
  Ensure that the system is not trying to convert incompatible units.
  
  
  
  If the conversion is not possible or not required:
  
  Adjust the process or interface to avoid the conversion.
  Use consistent units of measure in the source and target.
  
  
  
  
  Additional Information:
  
  Units of measure conversions are critical in logistics and inventory management to ensure correct quantities are handled.
  SAP stores conversion factors in the material master for alternative units of measure.
  In some cases, custom code or interfaces may attempt conversions that are not supported by standard data.
  Always ensure that units of measure are consistent across master data, transactions, and interfaces.
  
  
  Summary:
  
  
  
  Aspect
  Details
  
  
  
  
  Error
  Unit of measure &1 for material &2 could not be converted to UM &3
  
  
  Cause
  Missing or incorrect UoM conversion factor for material &2 between &1 and &3
  
  
  Solution
  Maintain correct UoM conversion in material master (MM02), verify units in CUNI, check customizing and outbound process
  
  
  Transactions
  MM02, CUNI, SPRO
  
  
  
  
  If you provide the specific material number and units involved, I can help you with more precise steps.