Purchase Order - Link Purchase Order to Bill
Linking Purchase Order to Bill
Purpose: To copy the details from the po to populate the forwarded bill from email fields.
This would enable the ease of processing bills; using the data already on the po and verifying the costs accordingly.
Also this is vital, so that you can match multiple bills to the same po.

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Mike Yates commented
We need the ability to link a Purchase Order and a Bill when it is submitted via email. Currently there is no way of knowing which Purchase Order a Bill is meant to be processed against.
Two reference fields on PO's and Bills would work, a dedicated 'PO number reference field' on a bill or a dedicated 'Bill reference field' on a PO.
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Diana Franklin commented
Similar to the need for two reference fields on a sales invoice, two reference fields on a purchase invoice (bill) would also be helpful.
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AdminXero Team (Admin, Xero) commented
Ability to transfer the reference number from Purchase order to Bill.
Purpose: To easily match the purchase order with the bill.