Split items shipped with same allocation ID

Hello,

If two items from the same order have the same allocation ID but they are splitted for shipment? Is it possible to create a splitted shipment with two different tracking numbers?

I tried to send them to veeqo via the /shipments endpoint, but if the allocation id for shipment 1 has been upload already, then I received a 400 error saying that the allocation ID already exist, so the order gets marked as shipped, but the second tracking number for the second item doesn’t uploads

Thank you