Copy Purchase Order Line Items To An Invoice

POST /api/.../invlineitems?source=polineids&invoiceid={invoiceid}

Copy one or more purchase order line items to an exisiting invoice. Click here for details.

Create a new Invoice and copy Purchase Order Line Items To The Invoice

POST /api/.../invoices?action=createinvoicewithpolines

Copy one or more purchase order line items to a newly created invoice. Click here for details.