Due to the following revision:
bdf630f9b8
When creating an invoice from a purchase order with an
analytic account set, the analytic account was no longer
copied on the invoice, as the analytic account that was added
thanks to
https://github.com/odoo/odoo/blob/9.0/addons/purchase/invoice.py#L53
was overwritten with `False` as `rec` was False
or if `rec` was True, it was overwritten with the analytic account
of `rec`.
opw-697702