How To Fix NAA109 - Error during conversion of unit of measure &1 to scale unit &2

SAP Error Message - Details

• Message type: E = Error

• Message class: NAA - Subsequent settlement (Purchasing)

• Message number: 109

• Message text: Error during conversion of unit of measure &1 to scale unit &2

What causes this issue?

Conversion of unit of measure &1& to scale unit &V2& of the scale basis
is not possible.

System Response

Business volume data is not updated as the business volume for the scale
basis is missing.

How to fix this error?

Ensure that the system is able to determine the business volume in the
form given above.
A suitable unit conversion should be defined for this in the material
master (alternative unit of measure) or info record. The system used
this data (info record, material master) to carry out the above
conversion, but without success.
Note that material and info record may be missing for settlement
documents, so in certain cases, no conversion at all is possible.
If necessary, contact your system administrator.

If you have the necessary authorization, you can maintain the material
master directly.
AUFRUF DER TRANSAKTION MATERIALSTAMM AENDERN

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

<DS:TRAN.MM02>Perform function</>
If you have the necessary authorization, you can maintain the info
record directly.
AUFRUF DER TRANSAKTION INFOSATZ AENDERN
<DS:TRAN.ME12>Perform function</>
ENDIF
The settlement document concerned has the number &V3&, item &V4&.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message NAA109 - Error during conversion of unit of measure &1 to scale unit &2 ?

  The SAP error message NAA109, which states "Error during conversion of unit of measure &1 to scale unit &2," typically occurs when there is an issue with converting a unit of measure (UoM) in the system. This can happen in various contexts, such as during material movements, inventory management, or when processing transactions that involve different units of measure.
  Causes:
  
  Incorrect Unit of Measure Configuration: The unit of measure may not be properly defined in the system, or there may be missing conversion factors between the units.
  Missing Conversion Factors: If the conversion factors between the source unit of measure and the target scale unit are not defined, the system cannot perform the conversion.
  Data Entry Errors: Incorrect data entry, such as using an unsupported or invalid unit of measure in a transaction.
  Inconsistent UoM Usage: Using different units of measure in the same transaction or process that are not compatible with each other.
  
  Solutions:
  
  
  Check Unit of Measure Configuration:
  
  Go to the transaction code CUNI (Unit of Measure Conversion) to review the configuration of the units involved.
  Ensure that both the source unit of measure (&1) and the target scale unit (&2) are defined correctly.
  
  
  
  Define Missing Conversion Factors:
  
  If conversion factors are missing, you can define them in the same transaction (CUNI).
  Make sure that the conversion factors are accurate and reflect the correct relationship between the units.
  
  
  
  Review Data Entry:
  
  Check the transaction or document where the error occurred for any incorrect entries.
  Ensure that the units of measure used are valid and supported by the system.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or help resources for specific details on unit of measure handling in your version of SAP.
  
  
  
  Testing:
  
  After making changes, perform a test transaction to ensure that the error is resolved.
  
  
  
  Related Information:
  
  
  Transaction Codes: 
  
  CUNI: For maintaining unit of measure conversions.
  MM02: For changing material master data, where you can check UoM settings.
  
  
  
  SAP Notes: Check SAP Notes for any known issues or patches related to unit of measure conversions.
  
  
  User Exits and BAdIs: If you have custom developments, ensure that they are not interfering with standard UoM conversions.
  
  
  If the issue persists after checking the above points, it may be beneficial to consult with your SAP support team or reach out to SAP support for further assistance.