Sales Order line stuck in Picked status with out Delivery

Summary:

Sales Order line stuck in Picked status and not associated with a shipment in Manage shipment line's of Inventory Management.

Assumption is that a user manually unassigned the following order line from the shipment and rest of the sale's order are ship confirmed in the order. How can we identify the user unassigned the following order line from the shipment and Shipment/ Delivery Number to which an order line is assigned to before un assignment.

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25A

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