Hi, what you assign is actually not Invoices, but Receipts
And this is one of the places where I think BC is inconvenient.
You can refer to the following way, but it is a little troublesome.
Create a freight invoice.

Assign...(Receipt)

Post...

Choose Find entries... in Posted Purchase invoice.

Click Value Entry.

You can find three records

You can find the receipt record through Item Ledger Entry No..


Hope this helps.
Thanks.
ZHU