How To Fix RSDS339 - Implicit conversion of external format not supported for field &1

SAP Error Message - Details

• Message type: E = Error

• Message class: RSDS - New DataSource

• Message number: 339

• Message text: Implicit conversion of external format not supported for field &1

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message RSDS339 - Implicit conversion of external format not supported for field &1 ?

  The SAP error message RSDS339, which states "Implicit conversion of external format not supported for field &1," typically occurs in the context of data extraction or transformation processes, particularly when dealing with data sources in SAP BW (Business Warehouse) or SAP HANA.
  Cause:
  This error arises when there is a mismatch between the data types or formats of the source data and the target data structure in SAP. Specifically, it indicates that the system is unable to automatically convert the data from one format to another for a specific field (denoted by &1 in the error message). Common causes include:
  
  Data Type Mismatch: The source field's data type does not match the target field's data type. For example, trying to load a string into a numeric field.
  Format Issues: The format of the data being extracted does not conform to the expected format in the target system. This can happen with date formats, decimal separators, etc.
  Incompatible Data Length: The length of the data in the source field exceeds the length defined in the target field.
  
  Solution:
  To resolve the RSDS339 error, you can take the following steps:
  
  
  Check Data Types: Verify the data types of the source and target fields. Ensure that they are compatible. If necessary, adjust the data types in the target structure to match the source.
  
  
  Adjust Field Formats: If the issue is related to formatting (e.g., date formats), you may need to apply transformations to convert the data into the expected format before loading it into the target.
  
  
  Modify Data Lengths: Ensure that the length of the data in the source does not exceed the defined length in the target. If it does, consider increasing the length of the target field or truncating the source data appropriately.
  
  
  Use Transformation Rules: If you are using a transformation in SAP BW, you can define specific transformation rules to handle the conversion explicitly rather than relying on implicit conversion.
  
  
  Check for Null Values: Sometimes, null or empty values can cause issues. Ensure that the data being processed does not contain unexpected nulls that could lead to conversion errors.
  
  
  Debugging: If the issue persists, consider using the SAP BW or HANA debugging tools to trace the data flow and identify where the conversion is failing.
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to RSDS339 for any specific patches or updates that may address known issues.
  Documentation: Review the SAP documentation for data extraction and transformation processes to understand the expected formats and types.
  Community Forums: Engage with SAP community forums or support channels for additional insights and solutions from other users who may have encountered similar issues.
  
  By following these steps, you should be able to identify and resolve the cause of the RSDS339 error in your SAP environment.