How To Fix 8B318 - Unit of measure &1 cannot be converted to &2 for material &3

SAP Error Message - Details

• Message type: E = Error

• Message class: 8B - Localization (Brazil)

• Message number: 318

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

What causes this issue?

To calculate certain taxes (e.g. 'IPI Pauta' or 'Sub.Trib.') in
Brazilian tax calculation, you have to convert using various units of
measure. This conversion is not possible using the units of measure/
material combination you have specified.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Maintain the conversion rules for the units of measure/material
combination specified or use other units of measure for this particular
business transaction.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message 8B318 - Unit of measure &1 cannot be converted to &2 for material &3 ?

  The SAP error message 8B318 indicates that there is an issue with the conversion of units of measure (UoM) for a specific material. This error typically arises when the system is unable to convert the specified unit of measure (UoM) to another unit of measure for a given material. Here’s a breakdown of the cause, potential solutions, and related information:
  Cause:
  
  Missing Conversion Factors: The conversion factors between the two units of measure are not defined in the system.
  Incorrect UoM Configuration: The units of measure may not be correctly configured in the material master or the relevant settings.
  Material Master Issues: The material master record may not have the necessary UoM settings or may be incomplete.
  Inconsistent UoM Usage: The UoM being used in the transaction may not be compatible with the UoM defined for the material.
  
  Solution:
  
  
  Check Material Master:
  
  Go to the material master record (transaction code MM03).
  Check the "Units of Measure" view to ensure that the required UoMs are defined and that conversion factors are set up correctly.
  
  
  
  Define Conversion Factors:
  
  If the conversion factors are missing, you can define them in the material master under the "Units of Measure" section.
  Ensure that the base unit of measure is correctly set and that all necessary conversions are defined.
  
  
  
  Review UoM Configuration:
  
  Check the configuration settings for units of measure in the SAP system (transaction code OMN3).
  Ensure that the UoMs are correctly defined and that the conversion settings are appropriate.
  
  
  
  Check Transaction Data:
  
  Review the transaction data where the error occurred to ensure that the correct UoMs are being used.
  Make sure that the UoM in the transaction matches one of the UoMs defined in the material master.
  
  
  
  Consult Documentation:
  
  If the issue persists, consult SAP documentation or reach out to your SAP support team for further assistance.
  
  
  
  Related Information:
  
  Unit of Measure (UoM): In SAP, UoMs are used to define how quantities of materials are measured and managed. Each material can have multiple UoMs, and conversion factors are used to convert between them.
  Material Master: The material master is a central repository of information about materials in SAP. It contains various views, including purchasing, sales, and accounting, where UoM settings are defined.
  Transaction Codes:
  
  MM03: Display Material Master
  OMN3: Define Units of Measure
  MM02: Change Material Master
  
  
  
  By following these steps, you should be able to resolve the error message 8B318 and ensure that the unit of measure conversions for the material are correctly configured.