diff --git a/modules/purchase_trade/__init__.py b/modules/purchase_trade/__init__.py
index 2649170..44dac07 100755
--- a/modules/purchase_trade/__init__.py
+++ b/modules/purchase_trade/__init__.py
@@ -167,6 +167,7 @@ def register():
         purchase.DocTemplate,
         purchase.DocTypeTemplate,
         purchase.PurchaseStrategy,
+        purchase.PriceComposition,
         backtoback.Backtoback,
         dimension.AnalyticDimension,
         dimension.AnalyticDimensionValue,
diff --git a/modules/purchase_trade/purchase.py b/modules/purchase_trade/purchase.py
index f17ec74..4f688a4 100755
--- a/modules/purchase_trade/purchase.py
+++ b/modules/purchase_trade/purchase.py
@@ -491,6 +491,13 @@ class Purchase(metaclass=PoolMeta):
                             logger.info("EFP_PRICE:%s",line.unit_price)
                             Line.save([line])
 
+class PriceComposition(ModelSQL,ModelView):
+    __name__ = 'price.composition'
+
+    line = fields.Many2One('purchase.line',"Purchase line")
+    component = fields.Char("Component")
+    price = fields.Numeric("Price")
+
 class Line(metaclass=PoolMeta):
     __name__ = 'purchase.line'
 
diff --git a/modules/purchase_trade/sale.py b/modules/purchase_trade/sale.py
index ee6b8ca..541ec7c 100755
--- a/modules/purchase_trade/sale.py
+++ b/modules/purchase_trade/sale.py
@@ -495,12 +495,11 @@ class Sale(metaclass=PoolMeta):
                             line.unit_price = d.price_index.get_price(Date.today(),line.unit,line.currency,True)
                             Line.save([line])
 
-class PriceComposition(ModelSQL,ModelView):
+class PriceComposition(metaclass=PoolMeta):
     __name__ = 'price.composition'
 
-    component = fields.Char("Component")
-    price = fields.Numeric("Price")
-
+    sale_line = fields.Many2One('sale.line',"Sale line")
+    
 class SaleLine(metaclass=PoolMeta):
     __name__ = 'sale.line'
 
@@ -594,7 +593,7 @@ class SaleLine(metaclass=PoolMeta):
     )
 
     pricing_rule = fields.Text("Pricing description")
-    price_composition = fields.One2Many('price.composition',"Price composition")
+    price_composition = fields.One2Many('price.composition','sale_line',"Price composition")
 
     @property
     def report_fixing_rule(self):