How To Fix MILL_OC038 - Unit of measure & is not allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: MILL_OC - Messages for order combination

• Message number: 038

• Message text: Unit of measure & is not allowed

What causes this issue?

You tried to combine orders the materials of which have different base
units of measure.
However, orders can only be combined if their materials have the same
base unit of measure.

System Response

The system terminates order combination.

How to fix this error?

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MILL_OC038 - Unit of measure & is not allowed ?

  The SAP error message MILL_OC038, which states "Unit of measure & is not allowed," typically occurs in the context of production planning or material management when the system encounters an invalid or inappropriate unit of measure (UoM) for a specific operation or material.
  Cause:
  
  Invalid Unit of Measure: The unit of measure being used for a material or operation is not defined or allowed in the system.
  Configuration Issues: The material master or the relevant configuration settings may not have the correct UoM settings.
  Data Entry Errors: There may be a typo or incorrect entry when specifying the unit of measure in the transaction.
  Material Type Restrictions: Certain material types may have restrictions on the units of measure that can be used.
  
  Solution:
  
  
  Check Material Master:
  
  Go to the material master record (transaction code MM03) and verify the unit of measure settings.
  Ensure that the UoM you are trying to use is listed in the "Units of Measure" tab.
  
  
  
  Review UoM Configuration:
  
  Check the configuration settings for units of measure in the SAP system (transaction code SPRO).
  Navigate to the relevant configuration path, usually under "Logistics" > "Material Management" > "Basic Settings" > "Units of Measure" to ensure that the UoM is defined correctly.
  
  
  
  Correct Data Entry:
  
  Double-check the entry of the unit of measure in the transaction where the error occurred. Ensure there are no typos or incorrect formats.
  
  
  
  Consult Documentation:
  
  Review any documentation or guidelines related to the specific material or operation to ensure compliance with the allowed units of measure.
  
  
  
  User Authorization:
  
  Ensure that the user has the necessary authorizations to use the specified unit of measure.
  
  
  
  Contact Support:
  
  If the issue persists after checking the above points, consider reaching out to your SAP support team or consulting SAP Notes for any known issues related to this error.
  
  
  
  Related Information:
  
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address this specific error message.
  Transaction Codes: Familiarize yourself with transaction codes like MM03 (Display Material), MM02 (Change Material), and SPRO (Customizing) for troubleshooting.
  Training: Consider training sessions or documentation on material management and unit of measure handling in SAP to prevent future occurrences.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.