How To Fix BIL181 - Cyclical access of overview function for schema extension not allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: BIL - General billing

• Message number: 181

• Message text: Cyclical access of overview function for schema extension not allowed

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message BIL181 - Cyclical access of overview function for schema extension not allowed ?

  The SAP error message BIL181, which states "Cyclical access of overview function for schema extension not allowed," typically occurs in the context of Business Intelligence (BI) or Business Warehouse (BW) when there is a cyclical reference in the data model or schema extension. This can happen when an overview function (like a query or a data source) is trying to access itself or is indirectly referencing itself through other objects, leading to a loop.
  Cause:
  
  
  Cyclical Reference: The primary cause of this error is a cyclical reference in the data model. This can occur if:
  
  A query or data source is defined in such a way that it references itself directly or indirectly.
  There are multiple objects that are interlinked in a way that creates a loop.
  
  
  
  Schema Extension Issues: If you are trying to extend a schema and the extension is trying to access an overview function that leads back to the original schema, this can trigger the error.
  
  
  Solution:
  
  
  Review Data Model: Check the data model for any cyclical references. Look for:
  
  Queries that reference themselves.
  Data sources that may be linked in a circular manner.
  
  
  
  Modify Queries: If you identify a query that is causing the cyclical reference, consider modifying it to remove the self-reference or to break the cycle.
  
  
  Check Schema Extensions: If you are working with schema extensions, ensure that the extension does not reference the original schema in a way that creates a cycle.
  
  
  Use Alternative Approaches: If necessary, consider redesigning the data model or the queries to avoid cyclical dependencies. This might involve creating new queries or data sources that do not rely on the problematic references.
  
  
  Testing: After making changes, test the queries and data sources to ensure that the error is resolved and that the data is being retrieved correctly.
  
  
  Related Information:
  
  Documentation: Refer to SAP documentation for guidelines on data modeling and query design to avoid cyclical references.
  SAP Notes: Check for any relevant SAP Notes that may provide additional insights or solutions related to this error.
  Community Forums: Engage with SAP community forums or support channels where similar issues may have been discussed, and solutions shared.
  
  By carefully analyzing the data model and making the necessary adjustments, you should be able to resolve the BIL181 error and prevent it from occurring in the future.