How To Fix /SAPAPO/ATP202 - Unit conversion from '&1' '&2' into '&3' '&4' is not possible

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/ATP -

• Message number: 202

• Message text: Unit conversion from '&1' '&2' into '&3' '&4' is not possible

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SAPAPO/ATP202 - Unit conversion from '&1' '&2' into '&3' '&4' is not possible ?

  The SAP error message /SAPAPO/ATP202 indicates that there is an issue with unit conversion in the Advanced Planning and Optimization (APO) module, specifically during the Available-to-Promise (ATP) check. The error message typically states that a conversion from one unit of measure (UoM) to another is not possible.
  Cause:
  
  Incompatible Units: The units of measure involved in the conversion are not compatible. For example, trying to convert between units that do not have a defined conversion factor in the system.
  Missing Conversion Factors: The necessary conversion factors between the units are not defined in the system. This can happen if the units are custom or not properly configured.
  Configuration Issues: There may be issues in the configuration of the material master or the unit of measure settings in the system.
  Data Inconsistencies: There could be inconsistencies in the data related to the material, such as incorrect unit definitions or missing data in the material master.
  
  Solution:
  
  
  Check Unit of Measure Configuration:
  
  Go to the transaction code CUNI (Unit of Measure Conversion) and verify that the conversion factors between the units involved are correctly defined.
  Ensure that the units of measure are compatible and that there is a valid conversion path.
  
  
  
  Review Material Master Data:
  
  Check the material master data for the affected material using transaction code MM03. Ensure that the units of measure are correctly defined and that the conversion factors are set up properly.
  Look for any inconsistencies in the data that might affect the ATP check.
  
  
  
  Adjust Settings in APO:
  
  If you are using APO, ensure that the settings for the relevant planning area and key figures are correctly configured to handle the units of measure involved.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or notes related to unit conversions in APO to see if there are any specific recommendations or known issues.
  
  
  
  Testing:
  
  After making changes, perform a test ATP check to see if the issue is resolved.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  CUNI: Unit of Measure Conversion
  MM03: Display Material
  MD04: Stock/Requirements List (to check stock levels and requirements)
  
  
  
  SAP Notes: Check SAP Notes for any known issues or patches related to unit conversion errors in APO.
  
  
  User Exits or BAdIs: If custom logic is involved in the ATP check, review any user exits or Business Add-Ins (BAdIs) that might affect unit conversions.
  
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.