Hi there! If you want to capture serial numbers only at time of shipment confirmation, you should use "basic serial numbers" i.e in item branch you change "lot process type" to <blank> (lots are optional) and set the "serial number required" to "Y"
This will show the serial number entry screen at time of shipment confirmation. You can view/revise serial number information in P4220
Be aware! There are no integration points to/from the basic serial numbers so if you have an external warehouse system feeding you with shipment confirmation records, you will need to create your own integration logic to receive the serial numbers (if using basic serial numbers)
This is also true if you need to send the serial number information via EDI to your customers.. (as the serial numbers are not stored in F4211 but in the basic serial numbers table )
Hope this helps..
/Aarto