The latest Quickbooks API spec allows for a a ItemAccountRef ref object.
ItemAccountRef
Optional
ReferenceType
Available with invoice objects, only, and when there is a linkedtxn of type ReimburseCharge for this object. When ItemRef.Id is set to 1, ItemAccountRef maps to the reimbursable charge account.
The latest Quickbooks API spec allows for a a
ItemAccountRef
ref object.ItemAccountRef Optional ReferenceType Available with invoice objects, only, and when there is a linkedtxn of type ReimburseCharge for this object. When ItemRef.Id is set to 1, ItemAccountRef maps to the reimbursable charge account.
https://developer.intuit.com/app/developer/qbo/docs/api/accounting/all-entities/invoice#full-update-an-invoice
v0.9.7 doesn't seem to support that reference object.