We used serialized items that are allocated to the SO Line before a shipment is created.
When a shipment is created, it adds 1 shipment line per individual serial number, instead of a shipment line for the total qty allocated and using the allocations window to record the serial numbers.
This means we've had to customize our Packing List form to re-aggregate the serials. It makes the shipment document slow and cumbersome when large quantities of serialized items are being shipped. It makes it difficult to verify quantities. It means we NEVER use the "Add from Order" option because the allocated serial numbers are listed individually and would need to be checked off individually.
It would make much more sense for our use of the system to have a single line created for the product being shipped with the allocations recorded in the TranSplit table.