How To Fix CPE309 - Only one default conversion rule permitted

SAP Error Message - Details

• Message type: E = Error

• Message class: CPE - Commodity Pricing Engine

• Message number: 309

• Message text: Only one default conversion rule permitted

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CPE309 - Only one default conversion rule permitted ?

  The SAP error message CPE309, which states "Only one default conversion rule permitted," typically occurs in the context of SAP's data conversion or mapping processes, particularly when dealing with conversion rules in the context of data migration or integration scenarios.
  Cause:
  The error arises when there are multiple default conversion rules defined for a particular data element or field. In SAP, a default conversion rule is intended to provide a single, standard way to convert data from one format to another. If the system detects more than one default rule for the same data element, it cannot determine which rule to apply, leading to this error.
  Solution:
  To resolve the CPE309 error, you should follow these steps:
  
  
  Identify the Data Element: Determine which data element or field is causing the error. This information is usually provided in the error message or can be inferred from the context in which the error occurred.
  
  
  Check Conversion Rules: Access the configuration settings for conversion rules in the relevant SAP module (e.g., SAP Data Services, SAP S/4HANA, etc.). Look for the conversion rules associated with the identified data element.
  
  
  Review Default Rules: Identify all the conversion rules that are marked as "default" for that data element. You may find that there are multiple rules set as default.
  
  
  Modify Rules: 
  
  If you find multiple default rules, you will need to decide which one should remain as the default. 
  Change the status of the other rules from "default" to a non-default status. This can usually be done in the configuration interface where the rules are defined.
  
  
  
  Test the Changes: After making the necessary adjustments, test the data conversion process again to ensure that the error has been resolved.
  
  
  Documentation: Document the changes made to the conversion rules for future reference and to maintain clarity in the configuration.
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes and Knowledge Base Articles for any specific guidance or updates related to this error. SAP frequently updates its documentation and may provide additional insights or patches.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered the same issue and what solutions they have implemented.
  Data Migration Tools: If you are using specific data migration tools (like SAP Data Services), refer to their documentation for best practices on managing conversion rules.
  
  By following these steps, you should be able to resolve the CPE309 error and ensure that your data conversion processes run smoothly.