How To Use "Terminate Workflow" with "All Except Current One" in Nintex Workflow

Problem 
In Nintex Workflow, workflows triggered by the same SharePoint list aren't automatically aware of each other. This makes it tricky to cleanly terminate "other" workflows when needed — for example, when enforcing a "latest run wins" scenario. 
 

Prerequisites 

1. Create dedicated tracking columns in your SharePoint list — one per workflow using the list.  
   • Name each column after its corresponding workflow. 
   • Type: Single line of text 
   • Important: 
     • Do not add these columns to the default view (uncheck the option when creating them). 
     • If you're deploying from Development → Production, make sure these columns also exist in Production, or your workflow will fail. 

Setup Instructions 

1. In each workflow, immediately after it starts, update the SharePoint list item:  
   • Write the current Workflow Instance ID to that workflow’s tracking column. 
2. When you want to use the “Terminate Workflow” action with “All except current one”:  
   • Loop through the tracking columns for the other workflows. 
   • For each:  
     • Check if there’s an existing instance ID. 
     • Use “Get Workflow Instance Details” to verify if that workflow is still running. 
     • If it is, call the Terminate Workflow action with that ID. 

Why This Works 
Since Nintex Workflow does not inherently know that workflows A, B, and C all belong to the same list item, this method manually tracks which workflow instances are active - giving you control to shut down any you don’t want to run anymore.