How To Fix 1F521 - Simulation run for &1 hierarchies

SAP Error Message - Details

• Message type: E = Error

• Message class: 1F - BKK: Beziehungen

• Message number: 521

• Message text: Simulation run for &1 hierarchies

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message 1F521 - Simulation run for &1 hierarchies ?

  The SAP error message 1F521 typically occurs during a simulation run for hierarchies in the context of SAP BW (Business Warehouse) or SAP BI (Business Intelligence). This error indicates that there is an issue with the hierarchy data or the configuration of the hierarchy itself.
  Cause:
  The error message 1F521 can be triggered by several factors, including:
  
  Missing Hierarchy Nodes: The hierarchy may reference nodes that do not exist or are not properly defined.
  Incorrect Hierarchy Structure: The hierarchy structure may be incorrect, such as circular references or invalid parent-child relationships.
  Data Inconsistencies: There may be inconsistencies in the data that the hierarchy is based on, such as missing or incorrect attributes.
  Authorization Issues: The user may not have the necessary authorizations to access the hierarchy or perform the simulation.
  Technical Issues: There could be technical issues with the SAP system, such as database inconsistencies or system configuration problems.
  
  Solution:
  To resolve the error message 1F521, you can take the following steps:
  
  
  Check Hierarchy Definition:
  
  Review the hierarchy definition in the SAP system to ensure that all nodes are correctly defined and that there are no missing nodes.
  Verify that the hierarchy structure is valid and does not contain circular references.
  
  
  
  Validate Data:
  
  Check the underlying data for the hierarchy to ensure that all required attributes are present and correctly populated.
  Run data consistency checks to identify any discrepancies in the data.
  
  
  
  Review Authorizations:
  
  Ensure that the user executing the simulation has the necessary authorizations to access the hierarchy and perform the simulation.
  
  
  
  Rebuild Hierarchy:
  
  If the hierarchy is corrupted, consider rebuilding it from scratch or restoring it from a backup if available.
  
  
  
  Check System Logs:
  
  Review the system logs (transaction SLG1) for any additional error messages or warnings that may provide more context about the issue.
  
  
  
  Consult SAP Notes:
  
  Search for relevant SAP Notes in the SAP Support Portal that may address this specific error message or provide additional troubleshooting steps.
  
  
  
  Contact SAP Support:
  
  If the issue persists after trying the above steps, consider reaching out to SAP Support for further assistance.
  
  
  
  Related Information:
  
  Transaction Codes: You may use transaction codes like RSA1 (Data Warehousing Workbench) to manage hierarchies and check their configurations.
  Documentation: Refer to SAP documentation for detailed information on managing hierarchies in BW/BI.
  Community Forums: Check SAP Community forums for discussions related to this error, as other users may have encountered and resolved similar issues.
  
  By following these steps, you should be able to identify and resolve the cause of the error message 1F521 in your SAP system.