diff --git a/modules/purchase_trade/pricing.py b/modules/purchase_trade/pricing.py
index d804a46..33e3c76 100755
--- a/modules/purchase_trade/pricing.py
+++ b/modules/purchase_trade/pricing.py
@@ -243,7 +243,7 @@ class PriceMatrixLine(ModelSQL, ModelView):
     destination = fields.Many2One('stock.location', "Destination")
 
     product = fields.Many2One('product.product', "Product")
-    quality = fields.Many2One('product.quality', "Quality")
+    quality = fields.Many2One('product.category', "Quality")
 
     price_value = fields.Numeric("Price", digits=(16, 6))