How To Fix RSM449 - No change of the source unit possible with fixed units

SAP Error Message - Details

• Message type: E = Error

• Message class: RSM -

• Message number: 449

• Message text: No change of the source unit possible with fixed units

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message RSM449 - No change of the source unit possible with fixed units ?

  The SAP error message RSM449, "No change of the source unit possible with fixed units," typically occurs in the context of SAP's logistics or inventory management modules, particularly when dealing with unit conversions or handling fixed units of measure.
  Cause:
  This error arises when you attempt to change the source unit of measure for a material or product that has been defined with fixed units. Fixed units are set in such a way that they cannot be altered or converted to another unit of measure. This is often the case for materials that have specific measurement requirements or regulatory constraints.
  Solution:
  To resolve this error, you can consider the following steps:
  
  
  Check Material Master Data:
  
  Go to the material master record (transaction code MM03) and check the unit of measure settings. Ensure that the unit of measure you are trying to change is not set as a fixed unit.
  
  
  
  Review Unit of Measure Settings:
  
  If the unit of measure is fixed, you may need to change the configuration settings in the material master. This can be done by:
  
  Going to transaction code MM02 (Change Material) and navigating to the relevant views (e.g., Basic Data, Purchasing, Sales).
  Look for the "Units of Measure" section and check if the unit is marked as fixed.
  
  
  
  
  
  Consult with Configuration Team:
  
  If you are unsure about changing the fixed unit settings, consult with your SAP configuration team or a functional consultant. They can provide guidance on whether it is appropriate to change the fixed unit settings based on business requirements.
  
  
  
  Use Alternative Units:
  
  If changing the fixed unit is not an option, consider using alternative units of measure that are not fixed for your transactions.
  
  
  
  Check for Dependencies:
  
  Ensure that there are no dependencies or transactions that are currently using the fixed unit. If there are, you may need to complete or reverse those transactions before making changes.
  
  
  
  Related Information:
  
  SAP Documentation: Refer to SAP Help documentation for detailed information on unit of measure settings and material master data management.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as MM01 (Create Material), MM02 (Change Material), and MM03 (Display Material) for managing material master data.
  User Roles and Authorizations: Ensure that you have the necessary authorizations to make changes to material master data.
  
  If the issue persists after following these steps, it may be beneficial to reach out to SAP support or your internal IT team for further assistance.