[FIX] purchase: added missing i18n call for UserError

closes odoo/odoo#52850

Related: odoo/enterprise#11098
Signed-off-by: oco-odoo <oco-odoo@users.noreply.github.com>

addons/purchase/i18n/purchase.pot

@@ -2157,3 +2157,10 @@ msgid ""
 "Your quotation contains products from company %s whereas your quotation belongs to company %s. \n"
 " Please change the company of your quotation or remove the products from other companies (%s)."
 msgstr ""
+
+
+#. module: purchase
+#: code:addons/purchase/models/purchase.py:0
+#, python-format
+msgid "You cannot change the type of a purchase order line. Instead you should delete the current line and create a new line of the proper type."
+msgstr ""

addons/purchase/models/purchase.py

@@ -606,7 +606,7 @@ class PurchaseOrderLine(models.Model):
 
     def write(self, values):
         if 'display_type' in values and self.filtered(lambda line: line.display_type != values.get('display_type')):
-            raise UserError("You cannot change the type of a purchase order line. Instead you should delete the current line and create a new line of the proper type.")
+            raise UserError(_("You cannot change the type of a purchase order line. Instead you should delete the current line and create a new line of the proper type."))
 
         if 'product_qty' in values:
             for line in self: