How To Fix MN559 - Overflow, calculation error or similar during unit conversion

SAP Error Message - Details

• Message type: E = Error

• Message class: MN - Message class for subsequent settlement (Purchasing)

• Message number: 559

• Message text: Overflow, calculation error or similar during unit conversion

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message MN559 - Overflow, calculation error or similar during unit conversion ?

  The SAP error message MN559, which indicates an "Overflow, calculation error or similar during unit conversion," typically occurs during processes that involve unit conversions, such as in inventory management, production planning, or when handling material movements. This error can arise due to various reasons, including incorrect unit definitions, data inconsistencies, or issues with the underlying calculations.
  Causes of MN559 Error
  
  
  Incorrect Unit Definitions: If the units of measure (UoM) are not defined correctly in the system, it can lead to calculation errors during conversions.
  
  
  Overflow in Calculations: This can happen if the values being processed exceed the maximum limits that can be handled by the system, especially in cases of large quantities or high precision.
  
  
  Data Inconsistencies: If there are inconsistencies in the master data (e.g., material master, unit of measure settings), it can lead to errors during calculations.
  
  
  Configuration Issues: Incorrect configuration in the material management or production planning modules can also lead to this error.
  
  
  Decimal Places: If the number of decimal places for a unit of measure is not set correctly, it can cause rounding issues leading to overflow.
  
  
  Solutions to MN559 Error
  
  
  Check Unit of Measure Settings:
  
  Go to the transaction code CUNI to check the unit of measure settings.
  Ensure that the base unit of measure and alternative units are defined correctly.
  
  
  
  Review Material Master Data:
  
  Use transaction code MM03 to review the material master data.
  Ensure that the units of measure are correctly assigned and that there are no inconsistencies.
  
  
  
  Check Configuration:
  
  Review the configuration settings in the relevant modules (e.g., MM, PP) to ensure that they are set up correctly.
  Check for any customizations that might affect unit conversions.
  
  
  
  Analyze the Calculation Logic:
  
  If you have access to the ABAP code or the calculation logic, review it to identify any potential issues that could lead to overflow.
  
  
  
  Test with Different Values:
  
  Try performing the same operation with smaller quantities to see if the error persists. This can help identify if the issue is related to specific values.
  
  
  
  Consult SAP Notes:
  
  Check the SAP Support Portal for any relevant notes or patches that address this specific error. There may be known issues or fixes available.
  
  
  
  Contact SAP Support:
  
  If the issue persists after trying the above solutions, consider reaching out to SAP support for further assistance.
  
  
  
  Related Information
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as MM03 (Display Material), CUNI (Unit of Measure), and MB1A (Goods Withdrawal) to troubleshoot the issue.
  Documentation: Review SAP documentation related to unit of measure and material management for best practices and guidelines.
  User Forums: Engage with SAP community forums or user groups where similar issues may have been discussed, and solutions shared.
  
  By following these steps, you should be able to identify and resolve the MN559 error in SAP.