diff --git a/addons/account_voucher/voucher_payment_receipt_view.xml b/addons/account_voucher/voucher_payment_receipt_view.xml
index 1169d5ef7c3..b4578c9b035 100644
--- a/addons/account_voucher/voucher_payment_receipt_view.xml
+++ b/addons/account_voucher/voucher_payment_receipt_view.xml
@@ -334,7 +334,7 @@
                                 <field name="writeoff_amount" widget="monetary" options="{'currency_field': 'currency_id'}"/>
                                 <field name="payment_option" required="1" attrs="{'invisible':[('writeoff_amount','=',0)]}"/>
                                 <field name="writeoff_acc_id"
-                                        attrs="{'invisible':['|', ('payment_option','!=','with_writeoff'), ('writeoff_amount','=',0)], 'required':[('payment_option','=','with_writeoff')]}"
+                                        attrs="{'invisible':['|', ('payment_option','!=','with_writeoff'), ('writeoff_amount','=',0)], 'required':[('payment_option','=','with_writeoff'), ('writeoff_amount','!=',0)]}"
                                         domain="[('type','=','other')]"/>
                                 <field name="comment"
                                         attrs="{'invisible':['|', ('payment_option','!=','with_writeoff'), ('writeoff_amount','=',0)]}"/>