diff --git a/modules/purchase_trade/__init__.py b/modules/purchase_trade/__init__.py
index df7f0bc..b96f4e0 100755
--- a/modules/purchase_trade/__init__.py
+++ b/modules/purchase_trade/__init__.py
@@ -266,10 +266,11 @@ def register():
         purchase.PurchaseAssociation,
         purchase.PurchaseCrop,
         module='lot', type_='model')
-    Pool.register(
-        sale.Sale,
-        sale.SaleLine,
-        sale.SaleCreatePurchaseInput,
+    Pool.register(
+        sale.CharterCondition,
+        sale.Sale,
+        sale.SaleLine,
+        sale.SaleCreatePurchaseInput,
         sale.Derivative,
         sale.Valuation,
         sale.ValuationLine,
diff --git a/modules/purchase_trade/sale.py b/modules/purchase_trade/sale.py
index 11ef108..bb92118 100755
--- a/modules/purchase_trade/sale.py
+++ b/modules/purchase_trade/sale.py
@@ -1252,6 +1252,16 @@ class PriceComposition(metaclass=PoolMeta):
 
     sale_line = fields.Many2One('sale.line',"Sale line")
 
+
+class CharterCondition(metaclass=PoolMeta):
+    __name__ = 'charter.condition'
+
+    sale = fields.Many2One(
+        'sale.sale', "Sale", ondelete='CASCADE')
+    sale_line = fields.Many2One(
+        'sale.line', "Sale Line", ondelete='CASCADE')
+
+
 class PremiumComposition(metaclass=PoolMeta):
     __name__ = 'premium.composition'
 
diff --git a/modules/purchase_trade/stock.py b/modules/purchase_trade/stock.py
index fb8bb02..e4a5dec 100755
--- a/modules/purchase_trade/stock.py
+++ b/modules/purchase_trade/stock.py
@@ -488,10 +488,6 @@ class CharterCondition(ModelSQL, ModelView):
         'purchase.purchase', "Purchase", ondelete='CASCADE')
     purchase_line = fields.Many2One(
         'purchase.line', "Purchase Line", ondelete='CASCADE')
-    sale = fields.Many2One(
-        'sale.sale', "Sale", ondelete='CASCADE')
-    sale_line = fields.Many2One(
-        'sale.line', "Sale Line", ondelete='CASCADE')
     party = fields.Many2One('party.party', "Party")
     party_role = fields.Selection([
         (None, ''),