To resolve the following error:

error_linenumber

Please consult the Purchase Order you are trying to invoice against. For example:

PO_line

When invoicing against the above Purchase Order, each line item in the invoice must correspond to a line item existing in the Purchase Order. As such, an invoice against the above Purchase Order must have Purchase Order Line item IDs "1" or "2". The below invoice will be rejected, as it has a "3" in the Purchase Order Line Number field:

PO_lineID