How To Fix CNV20201383 - Incorrect rule! Mask rule instead of prefix rule. &1;&2;&3;&4

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV20201 -

• Message number: 383

• Message text: Incorrect rule! Mask rule instead of prefix rule. &1;&2;&3;&4

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CNV20201383 - Incorrect rule! Mask rule instead of prefix rule. &1;&2;&3;&4 ?

  The SAP error message CNV20201383 indicates that there is an issue with the data conversion rules being used in a specific context, likely related to a data migration or transformation process. The message suggests that a "mask rule" is expected instead of a "prefix rule." 
  Cause:
  This error typically arises in scenarios where data transformation rules are defined incorrectly. Specifically, it indicates that the system is expecting a masking rule (which is used to format or transform data) but has encountered a prefix rule (which adds a prefix to the data). This mismatch can occur due to:
  
  Incorrect Configuration: The rules defined in the data migration or transformation process may not align with the expected format.
  Data Mapping Issues: The mapping of source data to target data may have been set up incorrectly, leading to the application of the wrong type of rule.
  Version or Compatibility Issues: If there are updates or changes in the SAP system or the data migration tool, it may lead to discrepancies in how rules are interpreted.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Review the Rules: Check the configuration of the data transformation rules in the relevant transaction or tool. Ensure that the rules are correctly defined as either mask rules or prefix rules as required by the context.
  
  
  Adjust the Mapping: If the mapping of the source and target fields is incorrect, adjust it to ensure that the correct type of rule is applied.
  
  
  Consult Documentation: Refer to the SAP documentation or help resources related to the specific data migration or transformation tool you are using. This can provide insights into the expected formats and rules.
  
  
  Test Changes: After making adjustments, run a test to ensure that the error is resolved and that the data transformation is functioning as expected.
  
  
  Seek Support: If the issue persists, consider reaching out to SAP support or consulting with a technical expert who specializes in SAP data migration.
  
  
  Related Information:
  
  Transaction Codes: Depending on the context, you may be using specific transaction codes related to data migration (e.g., LSMW, LTMC).
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance.
  Community Forums: SAP Community and other forums can be valuable resources for finding similar issues faced by other users and their solutions.
  
  By following these steps, you should be able to identify the root cause of the error and implement a suitable solution.