[FIX] purchase_discount: Prevent price_unit recursion error since https://github.com/odoo/odoo/commit/87ffe5983be7f0f4a926b458c4bd1f13001048ec
[FIX] purchase_discount: Prevent price_unit recursion error since https://github.com/odoo/odoo/commit/87ffe5983be7f0f4a926b458c4bd1f13001048ec

OCA/purchase-workflow,OCA/purchase-workflow