How To Fix ACM176 - Prefixed element name &1 of element &2 already exists (hash collision!)

SAP Error Message - Details

• Message type: E = Error

• Message class: ACM - Message-Class for all ACM functions/exceptions

• Message number: 176

• Message text: Prefixed element name &1 of element &2 already exists (hash collision!)

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message ACM176 - Prefixed element name &1 of element &2 already exists (hash collision!) ?

  The SAP error message ACM176, which states "Prefixed element name &1 of element &2 already exists (hash collision!)", typically occurs in the context of the ABAP Dictionary or when working with data elements, domains, or structures in SAP. This error indicates that there is a naming conflict due to a hash collision, meaning that two elements are being treated as having the same name or identifier, which is not allowed.
  Cause:
  
  Duplicate Naming: The most common cause of this error is that there are two or more elements (like fields, structures, or data elements) that have the same prefixed name. This can happen if you are trying to create a new element with a name that already exists in the same namespace.
  Namespace Issues: If you are working in a system with multiple namespaces (like customer namespaces), there might be a conflict between standard SAP elements and custom elements.
  Transport Issues: Sometimes, if you are transporting objects between systems, there might be a naming conflict that arises due to differences in the objects present in the source and target systems.
  
  Solution:
  
  Check for Duplicates: Review the elements in the ABAP Dictionary (SE11) to see if there are any existing elements with the same name. You can use the search functionality to find elements that might be causing the conflict.
  Rename Elements: If you find a duplicate, consider renaming the new element you are trying to create to avoid the conflict. Ensure that the new name is unique within the relevant namespace.
  Use Unique Prefixes: When creating new elements, use a unique prefix that is unlikely to collide with existing elements. This is especially important in environments where multiple developers are creating objects.
  Check Transport Requests: If the issue arose after a transport, check the transport requests to ensure that there are no conflicts between the objects being transported and those already in the target system.
  Clear Buffer: In some cases, clearing the buffer (transaction code /$SYNC) can help resolve temporary issues related to naming conflicts.
  
  Related Information:
  
  Transaction Codes: Use SE11 (Data Dictionary), SE80 (Object Navigator), or SE37 (Function Modules) to investigate the elements and their definitions.
  Documentation: Refer to SAP Help documentation for guidelines on naming conventions and best practices for creating data elements and structures.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message, as there may be specific fixes or recommendations provided by SAP.
  
  If the problem persists after trying the above solutions, consider reaching out to your SAP Basis or development team for further assistance, as they may have additional tools or insights to resolve the issue.