Perfect, I was missing items tag under expense.

Everything works fine before expense tag, moment I send expense attribute it gives the Invalid data. Do you see any issue in below JSON? "expense": [ { "account": {"id": "915"}, "department": {"id": "103"}, "class": {"id": "122"}, "memo": "Line Description Test1", "amount": 3000.55 } ]

file (actual invoice pdf).

I removed the postingperiod attribute and still getting same error. I believe something is wrong in the expense section.

@Francesca Nicole Mendoza-Oracle I am trying to do same and attach Vendor invoice in the VendorBill —> Communication. Is your answer apply for this too?