How To Fix R8350 - Compound key &1 for DataSource &2 is too long

SAP Error Message - Details

• Message type: E = Error

• Message class: R8 - Messages from the meta data generation

• Message number: 350

• Message text: Compound key &1 for DataSource &2 is too long

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message R8350 - Compound key &1 for DataSource &2 is too long ?

  The SAP error message R8350 indicates that the compound key for a DataSource is too long. This typically occurs when the combined length of the fields that make up the compound key exceeds the maximum allowed length in SAP BW (Business Warehouse) or in the underlying database.
  Cause:
  
  Exceeding Length Limit: The compound key is formed by concatenating multiple fields. If the total length of these fields exceeds the limit (usually 240 characters for BW), this error will occur.
  DataSource Configuration: The DataSource may be incorrectly configured, leading to an unintended combination of fields that results in a long compound key.
  Field Lengths: Individual fields that are part of the compound key may have been defined with longer lengths than necessary.
  
  Solution:
  
  
  Review DataSource Configuration:
  
  Check the DataSource definition in the SAP BW system.
  Identify the fields that are part of the compound key and their lengths.
  Consider removing unnecessary fields from the compound key or replacing them with shorter alternatives.
  
  
  
  Modify Field Lengths:
  
  If possible, reduce the length of the individual fields that are part of the compound key. This may involve changing the data type or length in the source system.
  
  
  
  Use a Different Key:
  
  If the compound key is not essential, consider using a different key or a single field as the key for the DataSource.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation for specific limits on compound key lengths and best practices for DataSource design.
  
  
  
  Testing:
  
  After making changes, test the DataSource to ensure that the error is resolved and that data is being extracted correctly.
  
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may provide additional insights or solutions for this specific error.
  Data Modeling Best Practices: Familiarize yourself with best practices for data modeling in SAP BW to avoid similar issues in the future.
  Performance Considerations: Keep in mind that overly complex keys can also impact performance, so aim for simplicity where possible.
  
  If the issue persists after trying the above solutions, it may be beneficial to consult with an SAP BW expert or reach out to SAP support for further assistance.