Steps to reproduce: Create an expense by sending an email. Make sure the product has a zero cost. Issue: The expense has no total amount even if a unit price is detected in the subject of the mail. Solution: Compute a total amount if we have a unit price. opw-3128566 closes odoo/odoo#115620 X-original-commit: eb629fa82cbf592184ed60d0bf309a26a4465b70 Signed-off-by: William André (wan) <wan@odoo.com>