How To Fix UCS0035 - Preceding task &1 not yet blocked by task &2 for &3

SAP Error Message - Details

• Message type: E = Error

• Message class: UCS0 - Messages for Status Management

• Message number: 035

• Message text: Preceding task &1 not yet blocked by task &2 for &3

What causes this issue?

Task &V1&, which precedes task &V2&, has not yet been blocked for &V3&.
Task &V2& cannot be blocked in this situation.

System Response

Informational message

How to fix this error?

To block task &V2&, you first need to block all of its preceding tasks,
including task &V1& for &V3& in particular.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message UCS0035 - Preceding task &1 not yet blocked by task &2 for &3 ?

  The SAP error message UCS0035 indicates that a task is trying to access a resource that is not yet blocked by a preceding task. This typically occurs in the context of background processing or when multiple tasks are trying to access the same resource in a specific sequence.
  Cause:
  The error arises when:
  
  A task (let's call it Task B) is attempting to execute before a preceding task (Task A) has completed its operation and properly blocked the resource it needs.
  This can happen in scenarios involving parallel processing, where tasks are dependent on each other, but the dependencies are not correctly managed.
  
  Solution:
  To resolve the UCS0035 error, consider the following steps:
  
  
  Check Task Dependencies: Ensure that the tasks are correctly sequenced. Task A must complete and block the resource before Task B can proceed. Review the logic in your background job or process chain to ensure that dependencies are correctly defined.
  
  
  Review Job Scheduling: If you are using background jobs, check the job scheduling settings. Make sure that the jobs are scheduled in the correct order and that there are no overlaps that could cause conflicts.
  
  
  Monitor Task Execution: Use transaction codes like SM37 (Job Monitoring) to check the status of the jobs. Look for any jobs that are still running or have failed, which might be causing the blockage.
  
  
  Adjust Resource Locking: If applicable, review the locking mechanism in your application. Ensure that the resource is being locked and released appropriately by the tasks.
  
  
  Error Handling: Implement error handling in your task logic to manage situations where a task cannot proceed due to resource availability. This could involve retry mechanisms or notifications.
  
  
  Consult Documentation: Refer to SAP documentation or notes related to your specific version and module to see if there are any known issues or patches that address this error.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SM37 (Job Monitoring), SM21 (System Log), and ST22 (Dump Analysis) to diagnose issues further.
  SAP Notes: Check SAP Notes for any updates or patches related to this error message. You can search for the error message number (UCS0035) in the SAP Support Portal.
  Community Forums: Engage with SAP community forums or user groups where similar issues may have been discussed, and solutions shared.
  
  By following these steps, you should be able to identify the root cause of the UCS0035 error and implement a solution to resolve it.