How To Fix MM109 - Conversion to the unit of measure chosen would result in an overflow

SAP Error Message - Details

• Message type: E = Error

• Message class: MM - Messages for material master maintenance and Customizing

• Message number: 109

• Message text: Conversion to the unit of measure chosen would result in an overflow

What causes this issue?

For one of the stock quantities, conversion to the unit of measure
chosen would result in a value that cannot be displayed in the stock
list due to its size.

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?

Please choose an alternative unit of measure with a smaller conversion
factor so that the new stock value can still be displayed.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MM109 - Conversion to the unit of measure chosen would result in an overflow ?

  The SAP error message MM109, which states "Conversion to the unit of measure chosen would result in an overflow," typically occurs in the Materials Management (MM) module when there is an issue with unit conversions during transactions involving quantities. This error can arise in various scenarios, such as during goods movements, inventory management, or when processing purchase orders.
  Cause:
  The error is generally caused by one of the following reasons:
  
  
  Large Quantity Values: The quantity being processed exceeds the maximum limit that can be represented in the target unit of measure. For example, if you are trying to convert a very large quantity from one unit of measure to another, the resulting value may exceed the maximum allowable value for that unit.
  
  
  Incorrect Unit of Measure Configuration: There may be an issue with the configuration of units of measure in the material master or the way they are defined in the system. If the conversion factors between units are not set up correctly, it can lead to overflow errors.
  
  
  Data Entry Errors: Sometimes, the error can be triggered by incorrect data entry, such as entering an excessively large quantity or an incorrect unit of measure.
  
  
  Solution:
  To resolve the MM109 error, you can take the following steps:
  
  
  Check Quantity Values: Review the quantity you are trying to process. Ensure that it is within a reasonable range and does not exceed the limits for the unit of measure you are using.
  
  
  Review Unit of Measure Configuration:
  
  Go to the material master record (transaction code MM03) and check the units of measure defined for the material.
  Verify the conversion factors between different units of measure. Ensure that they are set up correctly and that there are no discrepancies.
  
  
  
  Adjust Data Entry: If the error is due to incorrect data entry, correct the quantity or unit of measure being used in the transaction.
  
  
  Check for System Limitations: If you are working with very large quantities, check if there are any system limitations or settings that need to be adjusted to accommodate larger values.
  
  
  Consult Documentation or Support: If the issue persists, consult SAP documentation or reach out to your SAP support team for further assistance. They may provide insights specific to your system configuration.
  
  
  Related Information:
  
  Transaction Codes: MM03 (Display Material), MM02 (Change Material), and MMBE (Stock Overview) can be useful for checking material master data and stock levels.
  Unit of Measure Tables: The relevant tables for unit of measure conversions include T006 (Units of Measure) and T006A (Units of Measure: Language-dependent Texts).
  SAP Notes: Check for any SAP Notes related to MM109 for additional guidance or patches that may address known issues.
  
  By following these steps, you should be able to identify the cause of the MM109 error and implement a solution to resolve it.