Put deliveries on an invoice
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Attach delivery challans to the vendor's bill once it arrives.
Deliveries recorded on a challan have no bill until you attach them to one.
Go to Invoices and payments, tick the deliveries from one vendor, and press Associate with invoice. Choose the Invoice and press Attach to invoice.
You can only attach deliveries from the same vendor as the bill, and a delivery can only be on one bill.