Technically, this happens when there is an Application Lock in Session "Application Locks" (ttadv9598m000).
Which means that, there is another user probably busy with the Shipment Confirmation Process, and the Lock should get released when the user leaves the Shipments Session. However, sometimes a Lock remains and doesn't get removed due to various reasons.
So, you need to open the Application Locks, and delete the lock related to Shipments Session.
Hope this Helps You.
Sasi Kanth V
Infor ERP LN Solution Architect
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