# Customer order number on invoice from Sale Order
**URL:** https://discuss.tryton.org/t/customer-order-number-on-invoice-from-sale-order/7066
**Category:** Ideas
**Tags:** sales
**Created:** [March 8, 2024, 6:29am UTC](https://discuss.tryton.org/t/customer-order-number-on-invoice-from-sale-order/7066 "2024-03-08T06:29:41Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@vincent](https://discuss.tryton.org/u/vincent)
#### Post date: [March 8, 2024, 6:29am UTC](https://discuss.tryton.org/t/customer-order-number-on-invoice-from-sale-order/7066/1 "2024-03-08T06:29:41Z")
We use the Reference field on the Sale Order to record the customer purchase order number. As such, we are adding this field on the invoice.
I imagine we are not the only ones?
If so, would it make sense for this to be in the Tryton sale module?
I imagine this might be one of those things where the Reference may not be used for this purpose in some implementations and thus it might not make sense for this field to be surfaced on the invoice.
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### Author:  [@ced](https://discuss.tryton.org/u/ced)
#### Post date: [March 8, 2024, 8:15am UTC](https://discuss.tryton.org/t/customer-order-number-on-invoice-from-sale-order/7066/2 "2024-03-08T08:15:00Z")
It already exists in standard module with the “Origins” field.
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### Author:  [@vincent](https://discuss.tryton.org/u/vincent)
#### Post date: [March 8, 2024, 9:09am UTC](https://discuss.tryton.org/t/customer-order-number-on-invoice-from-sale-order/7066/3 "2024-03-08T09:09:52Z")
Yes, but not in the GUI.
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### Author:  [@ced](https://discuss.tryton.org/u/ced)
#### Post date: [March 8, 2024, 9:13am UTC](https://discuss.tryton.org/t/customer-order-number-on-invoice-from-sale-order/7066/4 "2024-03-08T09:13:06Z")
The link is on each invoice line and there is a relate at the document level.