For a product Productxyz you have maintained Serial Number Profile as Optional Serial Number Assignment in product master.
In the pick task 9999 you notice that Serial Numbers tab is missing.
SAP Business ByDesign
Reproducing the Issue
1. Go to Outbound Logistics workcenter and Task Control view.
2. Select Pick Task 9999 and Confirm.
In the following screen you notice that Serial Numbers tab is missing in the Details section.
Actual Quantity in the pick task 9999 is pre filled for the Open Quantity.
Therefore system assumes that there will be no more quantity to be entered and Serial Numbers tab is not visible.
Remove the pre filled Actual Quantity and refresh the pick task 9999 and the Serial Numbers tab will be visible.
Serial Numbers, Actual Quantity, Open Quantity, Pick Task, Serial Number Profile, Optional Serial Number Assignment , KBA , AP-ODP-ODR , Outbound Delivery Request , Product Enhancement