[FIX] do not use project from context

models/sale_project.py

@@ -332,7 +332,7 @@ class SaleProject(models.Model):
                             "sale_project_id": self.id,
                         }
                     )
-                    self.env["sale.order.line"].create(data)
+                    self.env["sale.order.line"].with_context(default_project_id=False).create(data)
         self.sale_order_id.clean_sale_order()