diff --git a/netforce_clinic/layouts/clinic_payment_form.xml b/netforce_clinic/layouts/clinic_payment_form.xml
index b357b57..5494b61 100644
--- a/netforce_clinic/layouts/clinic_payment_form.xml
+++ b/netforce_clinic/layouts/clinic_payment_form.xml
@@ -6,9 +6,12 @@
     <newline/>
     <field name="to_pay" readonly="1"/>
     <newline/>
-    <field name="complete" help="Mark as complete"/>
+    <group attrs='{"invisible":[["pay_amount","=",0]]}'>
+        <field name="complete" help="Mark as complete"/>
+    </group>
     <foot>
-        <button string="Cash" type="success" icon="ok" method="cash" confirm="Are you sure?"/>
-        <button string="Credit" type="default" icon="check" method="credit"/>
+        <button attrs='{"invisible":[["pay_amount","=",0]]}' string="Cash" type="success" icon="ok" method="cash" confirm="Are you sure?"/>
+        <button attrs='{"invisible":[["pay_amount","=",0]]}' string="Credit" type="default" icon="check" method="credit"/>
+        <button attrs='{"invisible":[["pay_amount","!=",0]]}' string="OK" type="success" icon="ok" method="credit"/>
     </foot>
 </form>