[FIX] purchase: update reference onchange of vendor_bill_purchase_id

Commit 1be873d4 removed the modification of the reference field
from the _onchange_origin.
The reasoning was that since this is an onchange on invoice_line_ids, it was
applied too often, which annoyed users in the case they overwrote that field.

However when using the "Autocomplete" field (vendor_bill_purchase_id),
then the user expects values to by modified.
Before, it worked by setting the origin field, which trickled down
to the reference.
Since that commit removed this, we re-add it explicitly in that case.

opw 1962364

closes odoo/odoo#32500

Signed-off-by: Nans Lefebvre (len) <len@odoo.com>

0 files changed, 0 insertions, 0 deletions