How To Fix BM804 - An external unit of measurement must be defined here

SAP Error Message - Details

• Message type: E = Error

• Message class: BM - Development class BZME - units of measure

• Message number: 804

• Message text: An external unit of measurement must be defined here

Self-Explanatory Message

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To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message BM804 - An external unit of measurement must be defined here ?

  The SAP error message BM804, which states "An external unit of measurement must be defined here," typically occurs in the context of material master data or when dealing with units of measurement in various SAP modules, such as MM (Materials Management) or SD (Sales and Distribution). This error indicates that the system expects an external unit of measurement to be defined for a particular material or process, but it is missing.
  Cause:
  
  Missing External Unit of Measurement: The most common cause of this error is that the external unit of measurement has not been defined for the material in question. This can happen if the material master data was not fully maintained or if the relevant configuration settings are incomplete.
  Incorrect Configuration: There may be issues with the configuration of units of measurement in the system, such as missing entries in the unit of measurement tables.
  Data Entry Errors: Sometimes, data entry errors during the creation or modification of material master records can lead to this issue.
  
  Solution:
  
  
  Define External Unit of Measurement:
  
  Go to the material master record (transaction code MM02 for change or MM01 for create).
  Navigate to the relevant views (e.g., Basic Data, Purchasing, Sales) and ensure that the external unit of measurement is defined.
  If it is missing, add the appropriate external unit of measurement.
  
  
  
  Check Configuration:
  
  Use transaction code OMN3 to check the configuration of units of measurement.
  Ensure that the external unit of measurement is correctly defined in the system. You may need to consult with your SAP configuration team to verify that the necessary settings are in place.
  
  
  
  Review Material Master Data:
  
  Check if the material master data is complete and correctly maintained. Ensure that all required fields are filled out properly.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or help files related to units of measurement for additional guidance on how to set them up correctly.
  
  
  
  Testing:
  
  After making the necessary changes, test the process again to ensure that the error does not occur.
  
  
  
  Related Information:
  
  Unit of Measurement Tables: Familiarize yourself with relevant tables such as T006 (Units of Measure) and T006A (Units of Measure: Language-dependent Texts) to understand how units of measurement are stored and configured in SAP.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. Sometimes, specific versions of SAP may have bugs that are documented in SAP Notes.
  User Authorization: Ensure that you have the necessary authorizations to make changes to material master data and configuration settings.
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP support team or a functional consultant who specializes in the relevant module.