How To Fix W8405 - Linkage for '&1-&2' <-> '&3' could not be created

W8405 - Overview

• Message type: E = Error

• Message class: W8 - Workflow: Expressions, data flow

• Message number: 405

• Message text: Linkage for '&1-&2' <-> '&3' could not be created

Self-Explanatory Message

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W8405 - Details

• The SAP error message:
  W8405 Linkage for '&1-&2' <-> '&3' could not be created
  typically occurs in the context of SAP Workflow or Business Object Repository (BOR) linkages, where the system tries to create a linkage (relationship) between two objects or entities but fails.
  
  Cause
  
  The system attempts to create a linkage (relationship) between two objects or entities identified by the placeholders &1, &2, and &3.
  The linkage cannot be created because:
  The objects/entities involved do not exist or are not valid.
  The linkage is already existing or conflicts with existing linkages.
  The user or process does not have the necessary authorization to create the linkage.
  There is a configuration or customization issue in the workflow or BOR.
  The linkage is not allowed due to business rules or system constraints.
  
  
  
  
  Solution
  
  
  Check the Objects/Entities:
  
  Verify that the objects/entities represented by &1, &2, and &3 exist and are valid.
  Ensure that the object keys or identifiers are correct.
  
  
  
  Check Existing Linkages:
  
  Use transaction codes like SWO1 (Business