How To Fix RFM_MM_PUR_PC042 - Order unit of item &1 cannot be converted from &2 to &3.

SAP Error Message - Details

• Message type: E = Error

• Message class: RFM_MM_PUR_PC -

• Message number: 042

• Message text: Order unit of item &1 cannot be converted from &2 to &3.

What causes this issue?

You have entered a principal purchase agreement item whose unit of
measure is not defined in the article master.

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?

Enter an article whose unit of measure is same as the principal purchase
agreement item or define the required unit of measure for the article.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message RFM_MM_PUR_PC042 - Order unit of item &1 cannot be converted from &2 to &3. ?

  The SAP error message RFM_MM_PUR_PC042 indicates that there is an issue with the order unit of a specific item in a purchasing document. The message states that the order unit of item &1 (where &1 is the item number) cannot be converted from &2 (the current unit) to &3 (the target unit). This typically occurs in scenarios involving unit of measure (UoM) conversions in purchasing documents, such as purchase orders or purchase requisitions.
  Cause:
  
  Incompatible Units of Measure: The units of measure defined for the item may not be compatible for conversion. For example, you might be trying to convert from a unit that cannot be directly converted to the target unit.
  Missing Conversion Factors: There may be no conversion factors defined in the system for the units involved. SAP requires conversion factors to be defined in the material master for different units of measure.
  Incorrect Configuration: The configuration settings for units of measure in the material master or the purchasing info record may be incorrect or incomplete.
  Item Master Data Issues: The item master data may not be set up correctly, leading to issues with unit conversions.
  
  Solution:
  
  
  Check Material Master Data:
  
  Go to the material master record for the item in question (transaction code MM03).
  Check the "Units of Measure" tab to ensure that the units of measure are correctly defined and that conversion factors are set up properly.
  
  
  
  Define Conversion Factors:
  
  If conversion factors are missing, you can define them in the material master. Navigate to the "Units of Measure" section and add the necessary conversion factors between the units.
  
  
  
  Review Purchasing Info Record:
  
  Check the purchasing info record (transaction code ME13) for the item to ensure that the correct units of measure are specified and that they match the material master.
  
  
  
  Check Configuration Settings:
  
  If you have access to configuration settings, ensure that the settings for units of measure in the relevant configuration areas (like MM module) are correct.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or help resources for additional guidance on unit of measure conversions and related settings.
  
  
  
  Test with Different Scenarios:
  
  If possible, test the conversion with different scenarios or items to see if the issue is isolated to a specific item or if it is a broader issue.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  MM03: Display Material Master
  ME13: Display Purchasing Info Record
  ME21N: Create Purchase Order
  ME22N: Change Purchase Order
  
  
  
  SAP Notes: Check for any relevant SAP Notes that may address known issues or provide additional guidance on this error message.
  
  
  Unit of Measure Configuration: Familiarize yourself with the configuration of units of measure in SAP, including how to set up and maintain them.
  
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.