diff --git a/addons/sale_margin/models/sale_order_line.py b/addons/sale_margin/models/sale_order_line.py
index 0130ec81451..c99f5e71850 100644
--- a/addons/sale_margin/models/sale_order_line.py
+++ b/addons/sale_margin/models/sale_order_line.py
@@ -14,7 +14,7 @@ class SaleOrderLine(models.Model):
         "Margin (%)", compute='_compute_margin', store=True, groups="base.group_user", precompute=True)
     purchase_price = fields.Float(
         string="Cost", compute="_compute_purchase_price",
-        digits='Product Price', store=True, precompute=True,
+        digits='Product Price', store=True, readonly=False, precompute=True,
         groups="base.group_user")
 
     @api.depends('product_id', 'company_id', 'currency_id', 'product_uom')