How To Fix M3370 - Reference unit cannot be copied (new base unit &)

SAP Error Message - Details

• Message type: E = Error

• Message class: M3 - Material Master

• Message number: 370

• Message text: Reference unit cannot be copied (new base unit &)

What causes this issue?

The conversion factors cannot be proposed as default values from the
reference material, because the two materials have different units of
measure.

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?

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message M3370 - Reference unit cannot be copied (new base unit &) ?

  The SAP error message M3370, which states "Reference unit cannot be copied (new base unit &)," typically occurs in the context of material master data management, particularly when dealing with units of measure (UoM) in SAP.
  Cause:
  This error usually arises when you are trying to create or change a material master record and the system detects an inconsistency or conflict with the units of measure. Specifically, it indicates that the reference unit of measure cannot be copied to the new base unit of measure you are trying to set. This can happen due to several reasons:
  
  Incompatible Units of Measure: The new base unit of measure you are trying to assign may not be compatible with the existing reference unit of measure.
  Missing Configuration: The necessary configuration for the new unit of measure may not be set up in the system.
  Incorrect Material Type: The material type you are working with may have restrictions on the units of measure that can be used.
  Existing Data Conflicts: There may be existing data or settings in the material master that conflict with the new base unit of measure.
  
  Solution:
  To resolve the M3370 error, you can take the following steps:
  
  
  Check Unit of Measure Configuration:
  
  Go to the transaction code OMU1 (or CUNI for unit of measure settings) to review the configuration of units of measure.
  Ensure that the new base unit of measure is defined and correctly configured in the system.
  
  
  
  Review Material Master Data:
  
  Use transaction code MM03 to display the material master record and check the existing units of measure.
  Verify that the reference unit of measure is compatible with the new base unit of measure.
  
  
  
  Adjust Material Type Settings:
  
  Check if the material type allows the use of the new base unit of measure. You can do this in the configuration settings for material types.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or help files related to units of measure and material master data to understand any specific requirements or restrictions.
  
  
  
  Test with Different Units:
  
  If possible, try using a different base unit of measure that is known to be compatible with the reference unit.
  
  
  
  Contact SAP Support:
  
  If the issue persists after checking the above points, consider reaching out to SAP support for further assistance, especially if this is a production issue.
  
  
  
  Related Information:
  
  Transaction Codes: 
  
  MM01 (Create Material), MM02 (Change Material), MM03 (Display Material), CUNI (Maintain Units of Measure).
  
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance.
  Documentation: Review the SAP Help Portal for detailed information on material master data and units of measure.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.