How To Fix WK007 - Substitution ended as not unique

SAP Error Message - Details

• Message type: E = Error

• Message class: WK - BPT: Messages integr. inbox

• Message number: 007

• Message text: Substitution ended as not unique

Self-Explanatory Message

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• What is the cause and solution for SAP error message WK007 - Substitution ended as not unique ?

  Certainly! Here's a detailed explanation for the SAP error message WK007 - "Substitution ended as not unique":
  
  Error Message: WK007 - Substitution ended as not unique
  
  Cause:
  This error occurs during the workflow substitution process in SAP when the system tries to determine a unique substitute for a user (for example, when a user is on leave or unavailable), but finds more than one valid substitution record that applies for the same period or criteria. Because multiple substitution entries are valid simultaneously, the system cannot decide which substitute to use, leading to the "not unique" error.
  In other words, the substitution rules or entries are overlapping or conflicting, causing ambiguity.
  
  When does it occur?
  
  When a workflow task is being routed to a substitute user.
  When the system checks the substitution entries in transaction SWDD or SWI1.
  During workflow runtime or when testing substitution rules.
  When multiple substitution entries exist for the same original user with overlapping validity periods or conditions.
  
  
  Typical Scenarios:
  
  Two or more substitution entries for the same user with overlapping validity dates.
  Substitution entries with the same priority or conditions that make them equally valid.
  Incorrect or incomplete configuration of substitution rules in transaction SWDD (Workflow Builder) or SWI2_FREQ (Substitution Overview).
  
  
  Solution:
  
  
  Check Substitution Entries:
  
  Use transaction SWI2_FREQ (Substitution Overview) to display all substitution entries for the affected user.
  Look for overlapping validity periods or multiple entries that apply simultaneously.
  Identify entries that cause ambiguity.
  
  
  
  Correct Overlapping Entries:
  
  Adjust the validity periods so that substitution entries do not overlap.
  If multiple substitutes are needed, define clear priorities or conditions to distinguish them.
  Delete or deactivate redundant or conflicting substitution entries.
  
  
  
  Check Substitution Rules:
  
  In transaction SWDD (Workflow Builder), check the substitution rules defined for the workflow.
  Ensure that the rules are designed to return a unique substitute.
  If necessary, enhance the substitution logic to handle multiple substitutes or to select one based on priority.
  
  
  
  Test Substitution:
  
  After corrections, test the substitution using transaction SWI1 or by triggering the workflow to ensure the substitution is unique and works as expected.
  
  
  
  Additional Checks:
  
  Verify if any custom code or user-exits related to substitution are causing multiple substitutes to be returned.
  Check for any recent changes in substitution configuration or workflow definitions.
  
  
  
  
  Related Information:
  
  
  Transactions:
  
  SWI2_FREQ – Substitution Overview
  SWDD – Workflow Builder (to check substitution rules)
  SWI1 – Workflow Log (to analyze workflow runtime and substitution)
  SU01 – User maintenance (to check user master data)
  
  
  
  SAP Notes:
  
  Check SAP Notes related to workflow substitution issues for your SAP version.
  
  
  
  Documentation:
  
  SAP Help Portal: Workflow Substitution
  SAP Workflow Administration guides
  
  
  
  
  Summary:
  
  
  
  Aspect
  Description
  
  
  
  
  Cause
  Multiple substitution entries valid simultaneously for the same user, causing ambiguity.
  
  
  Effect
  Workflow substitution fails with error WK007 "Substitution ended as not unique".
  
  
  Solution
  Review and correct substitution entries to ensure only one valid substitute exists at a time.
  
  
  Tools
  SWI2_FREQ, SWDD, SWI1, SU01
  
  
  
  
  If you need help with specific steps or screenshots, feel free to ask!