How To Fix O8843 - UoM, number of digits, and conversion factor cannot be changed

SAP Error Message - Details

• Message type: E = Error

• Message class: O8 - IS-Oil: TD Transportation and Distribution

• Message number: 843

• Message text: UoM, number of digits, and conversion factor cannot be changed

What causes this issue?

The UoM, number of digits, and conversion factor cannot be changed.

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?

Readings have already been taken using the rack meter. Therefore, the
above fields cannot be changed.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message O8843 - UoM, number of digits, and conversion factor cannot be changed ?

  The SAP error message O8843 indicates that there is an issue with the unit of measure (UoM) configuration in the system. Specifically, it states that the number of digits and the conversion factor for a unit of measure cannot be changed. This error typically arises when you attempt to modify the attributes of a unit of measure that is already in use or has been defined in a way that does not allow changes.
  Cause:
  
  Existing Usage: The unit of measure is already being used in various transactions or master data records, which prevents changes to its configuration.
  System Restrictions: SAP has built-in restrictions to maintain data integrity, especially for units of measure that are linked to material master records, purchasing documents, or sales documents.
  Configuration Settings: The unit of measure may have been defined in a way that does not allow changes to certain attributes after it has been created.
  
  Solution:
  
  Check Usage: Before attempting to change the UoM, check if it is being used in any material master records, purchase orders, sales orders, or other documents. If it is, you may need to create a new UoM instead of modifying the existing one.
  Create a New UoM: If changes are necessary, consider creating a new unit of measure with the desired attributes and then update the relevant records to use the new UoM.
  Consult Configuration: Review the configuration settings in the SAP system to understand the restrictions on the UoM. This may involve checking the settings in the SPRO transaction under the relevant logistics or material management sections.
  Data Migration: If you need to change the UoM for existing records, you may need to perform a data migration or update process to ensure that all relevant records are updated to reflect the new UoM.
  
  Related Information:
  
  Transaction Codes: You can use transaction codes like CUNI (Unit of Measure Conversion) to view and manage units of measure.
  Documentation: Refer to SAP Help documentation for detailed guidelines on managing units of measure and understanding the implications of changes.
  User Roles: Ensure that you have the necessary authorizations to make changes to UoM settings in the system.
  Testing: Always test changes in a development or quality assurance environment before applying them to the production system to avoid disruptions.
  
  If you continue to face issues, it may be beneficial to consult with your SAP support team or a functional consultant who specializes in material management or logistics.