[IMP] sale: down payment
[IMP] sale: down payment

- Create 2 SO, one with a down payment
- Validate the down payment invoice
- Select both SO, and choose "Invoice Orders"
- Create the invoice

The down payment is not deduced from the invoice.

It is more logical to take it into account at this point of the process.
However, changing this in stable is a major change of behavior.

opw-779954

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