Add new patch, issue12018.

issue12018.diff

@@ -0,0 +1,26 @@
+diff --git a/tryton/modules/commission/invoice.py b/tryton/modules/commission/invoice.py
+index f7e2fb3d9e..b3dbee52ea 100644
+--- a/tryton/modules/commission/invoice.py
++++ b/tryton/modules/commission/invoice.py
+@@ -168,7 +168,7 @@ class InvoiceLine(metaclass=PoolMeta):
+                 continue
+             with Transaction().set_context(date=self.invoice.currency_date):
+                 base_amount = Currency.compute(self.invoice.currency,
+-                    self.amount, agent.currency, round=False)
++                    self.amount, agent.currency, round=True)
+             amount = self._get_commission_amount(base_amount, plan)
+             if amount:
+                 amount = round_price(amount)
+diff --git a/tryton/modules/commission/commission.py b/tryton/modules/commission/commission.py
+index 08c693bdf1..2eabebc3e6 100644
+--- a/tryton/modules/commission/commission.py
++++ b/tryton/modules/commission/commission.py
+@@ -344,7 +344,7 @@ class Commission(ModelSQL, ModelView):
+         states=_readonly_states,
+         help="The product that is used on the invoice line.")
+     base_amount = Monetary(
+-        "Base Amount", currency='currency', digits='currency',
++        "Base Amount", currency='currency', digits=price_digits,
+         states=_readonly_states)
+     amount = Monetary(
+         "Amount", currency='currency', required=True, digits=price_digits,

series

@@ -39,3 +39,5 @@ issue11582.diff # [trytond] Add authentication services
 issue11582-sao.diff # [sao] Add authentication services
 
 issue11998.diff # [sale_shipment_grouping] KeyError when processing a sale with modules sale_shipment_cost and sale_shipment_grouping installed.
+
+issue12018.diff # [commission] Commissions: Incorrect round to Base Amount Field