Hi @pranitabisw,

once an RITM is in Closed Complete and its associated Workflow/Flow Context has completed, reopening a Catalog Task will not automatically reopen the RITM or resume the completed workflow/flow.

1. Reopening a Catalog Task
   • A task can be manually reopened if your process allows it.
   • Reopening the task does not automatically reopen the parent RITM.
2. Completed Workflow / Flow
   • Completed Workflow contexts cannot be resumed from the point where they ended.
   • Completed Flow Designer executions cannot be restarted from a completed activity.
3.  Approach
   • Reopen the RITM through a controlled process and trigger a new workflow/flow if additional fulfillment is required.
   • Alternatively, create a new Catalog Task or a new RITM linked to the original request for auditability.
     

In general, ServiceNow recommends creating a new fulfillment process rather than attempting to restart a completed workflow context.