diff --git a/modules/purchase_trade/docs/business-rules.md b/modules/purchase_trade/docs/business-rules.md
index 33671ec..605f093 100644
--- a/modules/purchase_trade/docs/business-rules.md
+++ b/modules/purchase_trade/docs/business-rules.md
@@ -1,8 +1,8 @@
 # Business Rules - Purchase Trade
 
 Statut: `draft`
-Version: `v0.5`
-Derniere mise a jour: `2026-04-10`
+Version: `v0.6`
+Derniere mise a jour: `2026-04-23`
 Owner metier: `a completer`
 Owner technique: `a completer`
 
@@ -389,6 +389,27 @@ Owner technique: `a completer`
 - Priorite:
   - `importante`
 
+### BR-PT-018 - Les contrats distinguent le compte bancaire tiers du compte bancaire compagnie
+
+- Intent: eviter de confondre le compte bancaire du client/fournisseur avec le
+  compte bancaire de la compagnie courante utilise pour encaisser ou payer.
+- Description:
+  - Sur `sale.sale` et `purchase.purchase`, `bank_account` represente le compte
+    bancaire propre a la `party` du contrat.
+  - Sur `sale.sale` et `purchase.purchase`, `our_bank_account` represente le
+    compte bancaire propre a `company.party`.
+  - Les deux champs sont limites aux comptes bancaires disponibles sur leur
+    party respective.
+- Resultat attendu:
+  - si plusieurs comptes existent, le compte dont la devise correspond a la
+    devise du contrat est propose en priorite
+  - si aucun compte ne matche la devise, le premier compte disponible est
+    propose
+  - le champ `Our Bank Account` reste modifiable par l'utilisateur dans le
+    domaine des comptes de la compagnie
+- Priorite:
+  - `importante`
+
 ### BR-PT-012 - Fallback valuation basis sans summary: utiliser le prix economique de la ligne
 
 - Intent: eviter qu'une valuation `basis` ouverte sorte a zero alors que la
diff --git a/modules/purchase_trade/purchase.py b/modules/purchase_trade/purchase.py
index 154f642..17ebf0e 100755
--- a/modules/purchase_trade/purchase.py
+++ b/modules/purchase_trade/purchase.py
@@ -263,10 +263,17 @@ class Purchase(metaclass=PoolMeta):
     bank_accounts = fields.Function(
         fields.Many2Many('bank.account', None, None, "Bank Accounts"),
         'on_change_with_bank_accounts')
-    bank_account = fields.Many2One(
-        'bank.account', "Bank Account",
-        domain=[('id', 'in', Eval('bank_accounts', []))],
-        depends=['bank_accounts'])
+    bank_account = fields.Many2One(
+        'bank.account', "Bank Account",
+        domain=[('id', 'in', Eval('bank_accounts', []))],
+        depends=['bank_accounts'])
+    our_bank_accounts = fields.Function(
+        fields.Many2Many('bank.account', None, None, "Our Bank Accounts"),
+        'on_change_with_our_bank_accounts')
+    our_bank_account = fields.Many2One(
+        'bank.account', "Our Bank Account",
+        domain=[('id', 'in', Eval('our_bank_accounts', []))],
+        depends=['our_bank_accounts'])
     from_location = fields.Many2One('stock.location', 'From location', required=True,domain=[('type', "!=", 'customer')])
     to_location = fields.Many2One('stock.location', 'To location', required=True,domain=[('type', "!=", 'supplier')])
     shipment_in = fields.Many2One('stock.shipment.in','Purchases')
@@ -324,22 +331,52 @@ class Purchase(metaclass=PoolMeta):
                     return account
         return party_bank_accounts[0]
 
+    def _get_default_our_bank_account(self):
+        if (not self.company or not self.company.party
+                or not self.company.party.bank_accounts):
+            return None
+        company_bank_accounts = list(self.company.party.bank_accounts)
+        if self.currency:
+            for account in company_bank_accounts:
+                if account.currency == self.currency:
+                    return account
+        return company_bank_accounts[0]
+
     @fields.depends('party', '_parent_party.bank_accounts')
     def on_change_with_bank_accounts(self, name=None):
         if self.party and self.party.bank_accounts:
             return [account.id for account in self.party.bank_accounts]
         return []
-
-    @fields.depends(
-        'company', 'party', 'invoice_party', 'payment_term', 'lines',
-        'bank_account', '_parent_party.bank_accounts')
+
+    @fields.depends('company', '_parent_company.party',
+        '_parent_company.party.bank_accounts')
+    def on_change_with_our_bank_accounts(self, name=None):
+        if (self.company and self.company.party
+                and self.company.party.bank_accounts):
+            return [account.id for account in self.company.party.bank_accounts]
+        return []
+
+    @fields.depends(
+        'company', 'party', 'invoice_party', 'payment_term', 'lines',
+        'bank_account', 'our_bank_account', '_parent_party.bank_accounts',
+        '_parent_company.party', '_parent_company.party.bank_accounts')
     def on_change_party(self):
         super().on_change_party()
         self.bank_account = self._get_default_bank_account()
+        self.our_bank_account = self._get_default_our_bank_account()
 
-    @fields.depends('party', 'currency', '_parent_party.bank_accounts')
+    @fields.depends(
+        'party', 'company', 'currency', '_parent_party.bank_accounts',
+        '_parent_company.party', '_parent_company.party.bank_accounts')
     def on_change_currency(self):
         self.bank_account = self._get_default_bank_account()
+        self.our_bank_account = self._get_default_our_bank_account()
+
+    @fields.depends('company', 'currency', 'our_bank_account',
+        '_parent_company.party', '_parent_company.party.bank_accounts')
+    def on_change_company(self):
+        super().on_change_company()
+        self.our_bank_account = self._get_default_our_bank_account()
 
     @classmethod
     def default_wb(cls):
diff --git a/modules/purchase_trade/sale.py b/modules/purchase_trade/sale.py
index 04e8cd1..c52b246 100755
--- a/modules/purchase_trade/sale.py
+++ b/modules/purchase_trade/sale.py
@@ -228,10 +228,17 @@ class Sale(metaclass=PoolMeta):
     bank_accounts = fields.Function(
         fields.Many2Many('bank.account', None, None, "Bank Accounts"),
         'on_change_with_bank_accounts')
-    bank_account = fields.Many2One(
-        'bank.account', "Bank Account",
-        domain=[('id', 'in', Eval('bank_accounts', []))],
-        depends=['bank_accounts'])
+    bank_account = fields.Many2One(
+        'bank.account', "Bank Account",
+        domain=[('id', 'in', Eval('bank_accounts', []))],
+        depends=['bank_accounts'])
+    our_bank_accounts = fields.Function(
+        fields.Many2Many('bank.account', None, None, "Our Bank Accounts"),
+        'on_change_with_our_bank_accounts')
+    our_bank_account = fields.Many2One(
+        'bank.account', "Our Bank Account",
+        domain=[('id', 'in', Eval('our_bank_accounts', []))],
+        depends=['our_bank_accounts'])
     from_location = fields.Many2One('stock.location', 'From location', required=True,domain=[('type', "!=", 'customer')])
     to_location = fields.Many2One('stock.location', 'To location', required=True,domain=[('type', "!=", 'supplier')])
     shipment_out = fields.Many2One('stock.shipment.out','Sales')
@@ -278,32 +285,63 @@ class Sale(metaclass=PoolMeta):
             self.company and self.company.party
             and self.company.party.name == 'MELYA')
 
-    def _get_default_bank_account(self):
-        if not self.party or not self.party.bank_accounts:
-            return None
-        party_bank_accounts = list(self.party.bank_accounts)
-        if self.currency:
+    def _get_default_bank_account(self):
+        if not self.party or not self.party.bank_accounts:
+            return None
+        party_bank_accounts = list(self.party.bank_accounts)
+        if self.currency:
             for account in party_bank_accounts:
-                if account.currency == self.currency:
-                    return account
-        return party_bank_accounts[0]
-
-    @fields.depends('party', '_parent_party.bank_accounts')
-    def on_change_with_bank_accounts(self, name=None):
-        if self.party and self.party.bank_accounts:
-            return [account.id for account in self.party.bank_accounts]
-        return []
-
-    @fields.depends(
-        'company', 'party', 'invoice_party', 'shipment_party', 'warehouse',
-        'payment_term', 'lines', 'bank_account', '_parent_party.bank_accounts')
-    def on_change_party(self):
-        super().on_change_party()
-        self.bank_account = self._get_default_bank_account()
-
-    @fields.depends('party', 'currency', '_parent_party.bank_accounts')
-    def on_change_currency(self):
-        self.bank_account = self._get_default_bank_account()
+                if account.currency == self.currency:
+                    return account
+        return party_bank_accounts[0]
+
+    def _get_default_our_bank_account(self):
+        if (not self.company or not self.company.party
+                or not self.company.party.bank_accounts):
+            return None
+        company_bank_accounts = list(self.company.party.bank_accounts)
+        if self.currency:
+            for account in company_bank_accounts:
+                if account.currency == self.currency:
+                    return account
+        return company_bank_accounts[0]
+
+    @fields.depends('party', '_parent_party.bank_accounts')
+    def on_change_with_bank_accounts(self, name=None):
+        if self.party and self.party.bank_accounts:
+            return [account.id for account in self.party.bank_accounts]
+        return []
+
+    @fields.depends('company', '_parent_company.party',
+        '_parent_company.party.bank_accounts')
+    def on_change_with_our_bank_accounts(self, name=None):
+        if (self.company and self.company.party
+                and self.company.party.bank_accounts):
+            return [account.id for account in self.company.party.bank_accounts]
+        return []
+
+    @fields.depends(
+        'company', 'party', 'invoice_party', 'shipment_party', 'warehouse',
+        'payment_term', 'lines', 'bank_account', 'our_bank_account',
+        '_parent_party.bank_accounts', '_parent_company.party',
+        '_parent_company.party.bank_accounts')
+    def on_change_party(self):
+        super().on_change_party()
+        self.bank_account = self._get_default_bank_account()
+        self.our_bank_account = self._get_default_our_bank_account()
+
+    @fields.depends(
+        'party', 'company', 'currency', '_parent_party.bank_accounts',
+        '_parent_company.party', '_parent_company.party.bank_accounts')
+    def on_change_currency(self):
+        self.bank_account = self._get_default_bank_account()
+        self.our_bank_account = self._get_default_our_bank_account()
+
+    @fields.depends('company', 'currency', 'our_bank_account',
+        '_parent_company.party', '_parent_company.party.bank_accounts')
+    def on_change_company(self):
+        super().on_change_company()
+        self.our_bank_account = self._get_default_our_bank_account()
     
     @classmethod
     def default_wb(cls):
diff --git a/modules/purchase_trade/view/purchase_form.xml b/modules/purchase_trade/view/purchase_form.xml
index e3d9313..1cbc716 100755
--- a/modules/purchase_trade/view/purchase_form.xml
+++ b/modules/purchase_trade/view/purchase_form.xml
@@ -82,5 +82,7 @@ this repository contains the full copyright notices and license terms. -->
     <xpath expr="/form/notebook/page[@id='info']/label[@name='invoice_party']" position="before">
         <label name="bank_account"/>
         <field name="bank_account"/>
+        <label name="our_bank_account"/>
+        <field name="our_bank_account"/>
     </xpath>
 </data>
diff --git a/modules/purchase_trade/view/sale_form.xml b/modules/purchase_trade/view/sale_form.xml
index 8ec11b5..57f491d 100755
--- a/modules/purchase_trade/view/sale_form.xml
+++ b/modules/purchase_trade/view/sale_form.xml
@@ -95,5 +95,7 @@ this repository contains the full copyright notices and license terms. -->
     <xpath expr="/form/notebook/page[@id='other']/label[@name='company']" position="before">
         <label name="bank_account"/>
         <field name="bank_account"/>
+        <label name="our_bank_account"/>
+        <field name="our_bank_account"/>
     </xpath>
 </data>