How To Fix RSRV391 - Dimension &1 is a line item dimension. No conversion takes place

SAP Error Message - Details

• Message type: E = Error

• Message class: RSRV -

• Message number: 391

• Message text: Dimension &1 is a line item dimension. No conversion takes place

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message RSRV391 - Dimension &1 is a line item dimension. No conversion takes place ?

  The SAP error message RSRV391 indicates that there is an issue related to a line item dimension in your SAP BW (Business Warehouse) system. This error typically arises when you attempt to perform a conversion or aggregation on a line item dimension, which is not allowed in SAP BW.
  Cause:
  
  Line Item Dimension: The dimension in question is a line item dimension, which means it is designed to store detailed transactional data. Line item dimensions are not meant to be aggregated or converted because they contain detailed records that do not have a meaningful aggregated value.
  Conversion Attempt: The error occurs when there is an attempt to perform a conversion (like changing the data type or aggregating values) on this line item dimension, which is not supported.
  
  Solution:
  
  Review the Query: Check the query or the process that is causing the error. Ensure that you are not trying to aggregate or convert data from a line item dimension.
  Adjust the Data Model: If you need to perform calculations or aggregations, consider creating a separate dimension or InfoObject that is not a line item dimension. This new dimension can be used for aggregated data.
  Use Key Figures: If you need to perform calculations, ensure that you are using key figures that are designed for aggregation rather than trying to manipulate the line item dimension directly.
  Check Data Flow: Review the data flow and transformations in your data model to ensure that line item dimensions are being handled appropriately.
  
  Related Information:
  
  Line Item Dimensions: In SAP BW, line item dimensions are typically used for detailed transactional data, such as sales orders or invoices. They are designed to hold detailed records and are not suitable for aggregation.
  InfoObjects: Understand the difference between line item dimensions and other types of dimensions (like attribute dimensions) in SAP BW. This knowledge can help you design your data model more effectively.
  SAP Documentation: Refer to SAP Help documentation for more details on line item dimensions and best practices for designing your BW data model.
  
  By addressing the root cause of the error and adjusting your approach to handling line item dimensions, you should be able to resolve the RSRV391 error effectively.