# New invoicing method when selling both goods and services

**URL:** <https://discuss.tryton.org/t/new-invoicing-method-when-selling-both-goods-and-services/345>\
**Category:** Feature\
**Tags:** sales\
**Created:** [April 18, 2017, 4:55pm UTC](https://discuss.tryton.org/t/new-invoicing-method-when-selling-both-goods-and-services/345 "2017-04-18T16:55:44Z")\
**Posts on this page:** 1\
**Showing post:** 10

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**Author:** ![ced](https://discuss-cdn.tryton.org/user_avatar/discuss.tryton.org/ced/32/1237_2.png) [@ced](https://discuss.tryton.org/u/ced)\
**Post date:** [December 23, 2020, 12:48pm UTC](https://discuss.tryton.org/t/new-invoicing-method-when-selling-both-goods-and-services/345/10 "2020-12-23T12:48:19Z")

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> [@tbruyere](#):
>
> These costs must be invoiced at the same time as the products of the shipment.

This is the role of the invoice method to decide when a sale line must be invoiced. It is not difficult to say that a service must be invoiced once a shipment has been done.

> [@tbruyere](#):
>
> If I’ve tested it well, can’t we use this service-type product concept to put a charge on a sale?

For shipment cost it is better to use `sale_shipment_cost` because the invoicing of the cost is done automatically when the shipments are done.

> [@tbruyere](#):
>
> Example of costs: for certain product we must create product test certificates, this type is indeed a service. We have to include this service on the sale because we have to give a confirmation of sale with this service included.

Indeed it is if you need to track that the service has been actually delivered.

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_[View the full topic](https://discuss.tryton.org/t/new-invoicing-method-when-selling-both-goods-and-services/345)._