Answer:
Here is the list of InvoiceItem fields that are supposed to be populated for preview an amend call.
“AccountingCode”,
“ChargeAmount”,
“ChargeDate”,
“ChargeDescription”,
“ChargeName”,
“ProductId”,
“Quantity”,
“ServiceEndDate”,
“ServiceStartDate”,
“TaxAmount”,
“TaxExemptAmount”,
“UnitPrice”,
“UOM”
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