How To Fix RM181 - Error converting the creation unit of measure

SAP Error Message - Details

• Message type: E = Error

• Message class: RM - Messages for Repetitive Manufacturing

• Message number: 181

• Message text: Error converting the creation unit of measure

What causes this issue?

The specified unit of entry does not correspond to the base unit of
measure. The system cannot convert it to the base unit of measure as
the conversions factors have not been maintained in the material master
record nor has the unit of measure been defined in the Table containing
the unit of measurements.

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?

Either enter another unit of measure or enter the conversion factor in
the material master record.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message RM181 - Error converting the creation unit of measure ?

  The SAP error message RM181, which states "Error converting the creation unit of measure," typically occurs when there is an issue with the conversion between different units of measure (UoM) in the context of material management or inventory management processes. This error can arise in various scenarios, such as during the creation of a material, when processing goods movements, or when performing inventory counts.
  Causes of RM181 Error
  
  
  Incorrect Unit of Measure Configuration: The unit of measure settings for the material may not be correctly defined in the material master. This includes the base unit of measure and any alternative units of measure.
  
  
  Missing Conversion Factors: If the conversion factors between the base unit of measure and the alternative units of measure are not defined or are incorrect, this can lead to conversion errors.
  
  
  Inconsistent Data: There may be inconsistencies in the data related to the material, such as discrepancies between the material master and the related documents (e.g., purchase orders, sales orders).
  
  
  Unit of Measure Group Issues: The unit of measure group assigned to the material may not be set up correctly, or the group may not include the necessary units of measure.
  
  
  Custom Code or Enhancements: If there are custom developments or enhancements in the system that manipulate unit of measure conversions, they may be causing the error.
  
  
  Solutions to RM181 Error
  
  
  Check Material Master Data:
  
  Go to the material master (transaction code MM03) and verify the unit of measure settings.
  Ensure that the base unit of measure and any alternative units of measure are correctly defined.
  
  
  
  Review Conversion Factors:
  
  Check the conversion factors between the base unit of measure and alternative units of measure in the material master.
  Ensure that all necessary conversion factors are defined and accurate.
  
  
  
  Validate Unit of Measure Groups:
  
  Check the unit of measure group assigned to the material (transaction code OME1).
  Ensure that the group includes all relevant units of measure and that they are correctly configured.
  
  
  
  Check for Inconsistencies:
  
  Review any related documents (e.g., purchase orders, sales orders) to ensure that they are consistent with the material master data.
  Correct any discrepancies found.
  
  
  
  Debug Custom Code:
  
  If there are custom developments that may affect unit of measure conversions, review the code for potential issues.
  Work with your ABAP developer to debug and resolve any problems.
  
  
  
  Consult SAP Notes:
  
  Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide additional guidance.
  
  
  
  Related Information
  
  
  Transaction Codes: 
  
  MM03: Display Material Master
  MM02: Change Material Master
  OME1: Maintain Unit of Measure Groups
  
  
  
  Documentation: Review SAP documentation related to material management and unit of measure handling for best practices and configuration guidelines.
  
  
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found.
  
  
  By following these steps, you should be able to identify the root cause of the RM181 error and implement the necessary corrections to resolve it.