How To Fix WU491 - Conversion from purchase to sales unit unsuccessful

SAP Error Message - Details

• Message type: E = Error

• Message class: WU - Promotion management messages

• Message number: 491

• Message text: Conversion from purchase to sales unit unsuccessful

What causes this issue?

A price calculation is needed for the creation of pricing conditions. A
purchase price and sales price with the same unit are required for
this. Conversion of the purchasing unit into the sales unit failed
because the system did not find an appropriate conversion factor.

System Response

The whole item is not activated. The activation indicator is set to D =
incorrect.

How to fix this error?

Enter an appropriate conversion factor in material master maintenance.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WU491 - Conversion from purchase to sales unit unsuccessful ?

  The SAP error message WU491, which states "Conversion from purchase to sales unit unsuccessful," typically occurs in the context of materials management and sales processes. This error indicates that there is an issue with the conversion of units of measure between purchasing and sales units for a specific material.
  Causes:
  
  Unit of Measure Configuration: The units of measure for the material may not be properly defined in the material master. This includes the base unit of measure, purchasing unit, and sales unit.
  Missing Conversion Factors: There may be missing or incorrect conversion factors between the purchase unit and sales unit in the material master.
  Material Master Data Issues: The material master data may not be correctly maintained, leading to inconsistencies in how units are defined and converted.
  Inconsistent Settings: The settings in the configuration for unit of measure conversions may not be consistent or correctly set up in the system.
  
  Solutions:
  
  
  Check Material Master Data:
  
  Go to the material master (transaction code MM03) and check the units of measure defined for the material.
  Ensure that the purchasing unit and sales unit are correctly defined and that the conversion factors are set up properly.
  
  
  
  Maintain Conversion Factors:
  
  If conversion factors are missing, you can maintain them in the material master under the "Units of Measure" view. Ensure that the conversion from the purchase unit to the sales unit is defined correctly.
  
  
  
  Review Unit of Measure Settings:
  
  Check the configuration settings for units of measure in the SAP system (transaction code OME1 for unit of measure settings). Ensure that the settings are consistent and correctly defined.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or help resources for specific guidance on unit of measure conversions and any related configuration settings.
  
  
  
  Test with Different Materials:
  
  If possible, test the conversion with other materials to see if the issue is isolated to a specific material or if it is a broader configuration issue.
  
  
  
  Contact SAP Support:
  
  If the issue persists after checking the above points, consider reaching out to SAP support for further assistance, especially if this is affecting business processes.
  
  
  
  Related Information:
  
  Transaction Codes: MM03 (Display Material), MM02 (Change Material), OME1 (Maintain Units of Measure).
  Material Master Views: Ensure you are familiar with the relevant views in the material master, such as Basic Data, Purchasing, and Sales views.
  Unit of Measure Conversion: Understand how unit of measure conversion works in SAP, including the importance of maintaining accurate conversion factors for seamless transactions.
  
  By following these steps, you should be able to identify and resolve the issue related to the WU491 error message in SAP.