How To Fix RSDS218 - More than three fields are over 255 characters long

SAP Error Message - Details

• Message type: E = Error

• Message class: RSDS - New DataSource

• Message number: 218

• Message text: More than three fields are over 255 characters long

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message RSDS218 - More than three fields are over 255 characters long ?

  The SAP error message RSDS218 indicates that there are more than three fields in a DataSource that exceed the maximum length of 255 characters. This is a limitation in SAP BW (Business Warehouse) DataSources, where only three fields can have a length greater than 255 characters.
  Cause:
  The error occurs when you attempt to create or modify a DataSource in SAP BW that has more than three fields defined with a character length greater than 255. This can happen when the underlying source system (like an SAP ERP system) has fields that are defined with long character lengths, and these fields are being mapped to the DataSource in BW.
  Solution:
  To resolve this issue, you can take the following steps:
  
  
  Review the DataSource Definition: Check the DataSource definition in the SAP BW system to identify which fields are exceeding the character limit.
  
  
  Modify Field Lengths: If possible, consider reducing the length of the fields in the source system or in the DataSource definition. This may involve:
  
  Truncating the data in the source system.
  Creating a new DataSource that only includes the necessary fields with lengths under 255 characters.
  
  
  
  Use Data Transformation: If you need to keep the long fields, consider using a transformation to split the data into multiple fields or to summarize the data in a way that fits within the character limit.
  
  
  Check for Alternatives: If the fields are essential and cannot be shortened, you may need to explore alternative ways to model the data in BW, such as using InfoObjects or other structures that can accommodate longer text.
  
  
  Consult Documentation: Refer to SAP documentation or support for any specific guidelines or best practices related to DataSource design and limitations.
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that might provide additional insights or updates regarding this limitation.
  DataSource Design Best Practices: Familiarize yourself with best practices for designing DataSources in SAP BW to avoid similar issues in the future.
  Performance Considerations: Be aware that having many long fields can impact performance, so it's essential to balance the need for data with system efficiency.
  
  If the problem persists after trying these solutions, consider reaching out to SAP support for further assistance.