How To Fix M3397 - Conversion may not be changed for base unit of measure

SAP Error Message - Details

• Message type: E = Error

• Message class: M3 - Material Master

• Message number: 397

• Message text: Conversion may not be changed for base unit of measure

What causes this issue?

You have attempted by batch input to specify conversion factors for the
base unit of measure.

System Response

However, this does not make any sense and is therefore stopped by the
system.

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 M3397 - Conversion may not be changed for base unit of measure ?

  The SAP error message M3397, "Conversion may not be changed for base unit of measure," typically occurs when there is an attempt to change the conversion factor for a material's base unit of measure in a way that is not allowed by the system. This can happen in various scenarios, such as when trying to modify the material master data or during certain transactions that involve unit conversions.
  Cause:
  
  Inconsistent Data: The error often arises when there are existing transactions or data that depend on the current conversion factors. Changing these factors could lead to inconsistencies in inventory, accounting, or reporting.
  Locked Data: The material may be locked for changes due to ongoing transactions or other processes that are using the material.
  Configuration Settings: The system configuration may restrict changes to the base unit of measure or its conversion factors to maintain data integrity.
  
  Solution:
  
  Check Existing Transactions: Before making changes, ensure that there are no open transactions (like purchase orders, sales orders, or stock movements) that would be affected by the change. If there are, you may need to complete or cancel those transactions first.
  Review Material Master Data: Go to the material master record and check the current base unit of measure and conversion factors. Ensure that any changes you want to make are valid and do not conflict with existing data.
  Use the Correct Transaction: Make sure you are using the appropriate transaction code for changing the material master data. For example, use MM02 for changing material data.
  Consult with a SAP Administrator: If you are unsure about the changes or if the error persists, consult with your SAP administrator or a functional consultant. They can provide insights into the configuration settings and any restrictions that may be in place.
  Check Configuration Settings: If you have the necessary access, review the configuration settings in the SAP system related to units of measure and conversions. Ensure that they allow for the changes you are trying to make.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific notes related to error M3397. SAP frequently updates its knowledge base with solutions and workarounds for common issues.
  Documentation: Review SAP documentation regarding material master data management, especially sections related to units of measure and conversion factors.
  Training: If you frequently encounter this error, consider training on material management and master data management in SAP to better understand how to manage units of measure and conversions effectively.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.