How do you record.....

Received customer purchase order No. 53426 from Rosemont University, approved their credit and shipped the goods. All goods were shipped, EXCEPT that only 45 shoulder pad sets were available for shipment.

Carrier & number: Allied Trucking; Carrier number 2154

Freight charges: FOB shipping point (i.e., will be paid by Rosemont)

Route: Express

Truck & Driver: Truck 2961XZ, John Arens

Freight rate: $37.00 per 100 lbs.

Shipment: 5 cartons/goal and rim sets @ 42 lbs./carton

2 cartons/backboards @ 123 lbs./carton

9 cartons/shoulder pad sets @ 30 lbs./carton

4 cartons/football helmets @ 32 lbs./carton

It says I record an entry in the Sales Journal & Accounts Receivable Subsidiary Ledger.

I am confused because I can't find where an Invoice number would be?