New invoicing method when selling both goods and services

[ced (Cédric Krier)]

For me, it is a too complex topic to be solved in a generic way.

@nicoe

Thus I think that a way to group sale lines together should be defined, probably a new object that would be put on every lines that relate together.

I do not think it will be practicable. At best it could be a package line which is composed of a set of products. But this is another topic.

@nicoe

According to me the default behavior should be that the service is invoiced as soon as the first related good is shipped (and thus invoiced) but the design should permit to change this easily.

I do not think there will be a consensus about what is a good default behavior. Each company will have its own rule.

I do not think we should have any new module on this topic but we should ensure that the API of the sale methods allow to be customized easily.