How To Fix WZ119 - Instances for task &1 already exist

SAP Error Message - Details

• Message type: E = Error

• Message class: WZ - Workflow: Model objects

• Message number: 119

• Message text: Instances for task &1 already exist

Self-Explanatory Message

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• What is the cause and solution for SAP error message WZ119 - Instances for task &1 already exist ?

  Certainly! Here's a detailed explanation for the SAP error message WZ119: Instances for task &1 already exist:
  
  Error Message
  WZ119: Instances for task &1 already exist
  
  Cause
  This error occurs in SAP Workflow when you try to create or start a new instance of a workflow task, but an instance of that task already exists for the same object or context. In other words, the system prevents duplicate task instances to avoid redundant processing or conflicts.
  Common scenarios include:
  
  Attempting to create a new workflow task instance while an active instance of the same task is already running for the same object.
  The workflow logic or custom code tries to create multiple instances of a task that is designed to be unique per object.
  The task is set up as a "single instance" task, and the system enforces this uniqueness.
  
  
  Explanation
  In SAP Workflow, tasks can be configured to allow multiple instances or only a single instance per object. When a task is configured to allow only one instance per object, the system checks if an instance already exists before creating a new one. If it finds an existing instance, it raises the WZ119 error to prevent duplication.
  
  Solution
  To resolve this error, consider the following steps:
  
  
  Check Existing Task Instances:
  
  Use transaction SWI6 (Task Overview) or SWI1 (Work Item Selection) to check if there are active instances of the task for the object in question.
  If the existing instance is no longer needed, you may complete or delete it.
  
  
  
  Review Workflow Design:
  
  Verify if the task is intended to be unique per object.
  If multiple instances are required, adjust the task configuration to allow multiple instances.
  
  In the task definition (transaction PFTC), check the "Single Instance" flag and adjust accordingly.
  
  
  
  
  
  Modify Workflow Logic:
  
  If the workflow or custom code is trying to create duplicate instances, add logic to check for existing instances before creating new ones.
  Use function modules like SAP_WAPI_TASK_EXISTS to check if a task instance already exists.
  
  
  
  Clean Up Stale Instances:
  
  Sometimes, old or stuck task instances cause this error.
  Use transaction SWI2_FREQ or SWI1 to find and delete or complete these instances.
  
  
  
  Consult Workflow Logs:
  
  Use transaction SWI2_DIAG or SWI2_FREQ to analyze workflow logs and identify why duplicate creation is attempted.
  
  
  
  
  Related Information
  
  
  Transaction Codes:
  
  PFTC – Task Maintenance
  SWI1 – Work Item Selection
  SWI6 – Task Overview
  SWI2_FREQ – Workflow Log
  SWI2_DIAG – Workflow Diagnosis
  
  
  
  Function Modules:
  
  SAP_WAPI_TASK_EXISTS – Check if a task instance exists for an object.
  
  
  
  SAP Notes:
  
  Check for any SAP Notes related to workflow task instance management or this specific error message.
  
  
  
  Documentation:
  
  SAP Help Portal: Workflow Task Management
  SAP Workflow Administration Guide
  
  
  
  
  Summary
  
  
  
  Aspect
  Details
  
  
  
  
  Cause
  Attempt to create a duplicate instance of a workflow task that already exists.
  
  
  Solution
  Check and complete/delete existing instances, adjust task configuration, or modify logic.
  
  
  Tools
  Transactions: PFTC, SWI1, SWI6, SWI2_FREQ; Function Module: SAP_WAPI_TASK_EXISTS
  
  
  
  
  If you provide more context (e.g., which workflow or task, custom code involved), I can help with more specific guidance.