How To Fix KP591 - Unit of measure &1 cannot be converted to resource unit &2

SAP Error Message - Details

• Message type: E = Error

• Message class: KP - CO-OM Planning

• Message number: 591

• Message text: Unit of measure &1 cannot be converted to resource unit &2

What causes this issue?

You have transferred unit of measure &V1& to the planning data
interface for a resource planning. However, unit &V2& is stored in the
master record for resource &V3&. Conversion between these units is not
possible.

System Response

The record is updated using the unit of measure in the master record.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message KP591 - Unit of measure &1 cannot be converted to resource unit &2 ?

  The SAP error message KP591 indicates that there is an issue with the conversion of a unit of measure (UoM) to a resource unit in the context of cost planning or activity planning. This typically occurs when the system is unable to convert the specified unit of measure into the unit of measure that is required for the resource.
  Cause:
  
  Missing Conversion Factors: The conversion factors between the specified unit of measure and the resource unit may not be defined in the system.
  Incorrect Unit of Measure: The unit of measure being used may not be valid for the resource or may not be set up correctly in the system.
  Configuration Issues: There may be configuration issues in the material master or resource master data that prevent the conversion from occurring.
  Inconsistent Data: There may be inconsistencies in the data related to units of measure in the relevant master records.
  
  Solution:
  
  
  Check Unit of Measure Configuration:
  
  Go to the transaction code CUNI (Unit of Measure Conversion) to check if the conversion factors between the units of measure are defined correctly.
  Ensure that the unit of measure you are trying to use is set up in the system and has a valid conversion to the resource unit.
  
  
  
  Review Master Data:
  
  Check the material master (transaction code MM03) and resource master (transaction code CR02) to ensure that the units of measure are correctly defined and consistent.
  Verify that the relevant UoM is assigned to the material/resource and that it is valid for the operations being performed.
  
  
  
  Adjust Planning Parameters:
  
  If you are using planning parameters, ensure that they are set correctly to allow for the conversion of units of measure.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or help files related to unit of measure conversions and resource planning for additional guidance.
  
  
  
  Contact SAP Support:
  
  If the issue persists after checking the above points, consider reaching out to SAP support for further assistance, especially if it appears to be a system bug or requires deeper investigation.
  
  
  
  Related Information:
  
  Transaction Codes: 
  
  CUNI - Unit of Measure Conversion
  MM03 - Display Material
  CR02 - Change Resource
  
  
  SAP Notes: Check for any relevant SAP Notes that may address known issues or provide patches related to unit of measure conversions.
  Documentation: Review the SAP Help Portal for detailed information on unit of measure handling and resource planning.
  
  By following these steps, you should be able to identify and resolve the cause of the KP591 error message in SAP.