How To Fix RSDS391 - Transfer of LOB column &1 not supported for subscription type 'Insert'

SAP Error Message - Details

• Message type: E = Error

• Message class: RSDS - New DataSource

• Message number: 391

• Message text: Transfer of LOB column &1 not supported for subscription type 'Insert'

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message RSDS391 - Transfer of LOB column &1 not supported for subscription type 'Insert' ?

  The SAP error message RSDS391 indicates that there is an issue with transferring a Large Object (LOB) column when using a subscription type of 'Insert' in the context of SAP Data Services or SAP BW (Business Warehouse). LOB columns typically refer to large data types such as BLOB (Binary Large Object) or CLOB (Character Large Object), which are used to store large amounts of binary or text data.
  Cause:
  The error occurs because the system does not support the transfer of LOB columns when the subscription type is set to 'Insert'. This limitation is often due to the way LOB data is handled in the underlying database or the data transfer mechanism used in SAP.
  Solution:
  To resolve this issue, you can consider the following approaches:
  
  
  Change Subscription Type: If possible, change the subscription type from 'Insert' to a type that supports LOB transfers, such as 'Update' or 'Delete'. This may allow the LOB data to be processed correctly.
  
  
  Exclude LOB Columns: If the LOB data is not essential for your current operation, you can modify your data model or extraction logic to exclude the LOB columns from the transfer. This can be done by adjusting the data flow or transformation logic in your data services.
  
  
  Use Alternative Data Transfer Methods: If you need to transfer LOB data, consider using alternative methods or tools that can handle LOB data more effectively. This might involve using different data extraction or loading techniques that are designed to work with LOBs.
  
  
  Check SAP Notes and Documentation: Look for any relevant SAP Notes or documentation that may provide additional insights or updates regarding the handling of LOB columns in your specific version of SAP. SAP frequently updates its software, and there may be patches or enhancements available.
  
  
  Consult with SAP Support: If the issue persists and you cannot find a suitable workaround, consider reaching out to SAP Support for assistance. They may have specific recommendations based on your system configuration and version.
  
  
  Related Information:
  
  SAP Data Services Documentation: Review the official SAP Data Services documentation for guidelines on handling LOB data and supported operations.
  SAP BW Documentation: If you are working within SAP BW, consult the BW documentation for information on data modeling and LOB handling.
  Database Documentation: Depending on the underlying database (e.g., Oracle, SQL Server), check the database documentation for specifics on LOB handling and limitations.
  
  By following these steps, you should be able to address the RSDS391 error and successfully manage LOB data in your SAP environment.