Waiting tasks remain in WAITING (PARALLEL TASK) status after removing simultaneous execution limit

Products

• Automic Automation

Issue/Introduction

Changing an object's "Allow simultaneous executions" setting from a fixed limit to unlimited while tasks are already queued causes the previously-queued tasks to remain in status WAITING (PARALLEL TASK) indefinitely, even when no other instance of that object is active.

Expected: once nothing else is blocking them, previously-waiting tasks should be able to proceed.
Actual: pre-existing waiting tasks never resume - only tasks generated after the setting change run normally under the new limit.

Environment

Release: v24.x  26.x

Component: Automation Engine 

Cause

DE210384

Resolution

Workaround:

Filter the tasks stuck in WAITING (PARALLEL TASK) status via process monitoring & Cancel the stuck instances.
Relaunch the jobs; the new instances will correctly pick up the updated unlimited setting.

Solution:

Update to a fix version listed below or a newer version if available.

Fix version:

Component(s): Automation Engine

Automation.Engine TBA - TBA