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snippets/hr_expense.hr_expense_view_form.hide_payment_mode.xml

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+<?xml version="1.0"?>
+<data inherit_id="hr_expense.hr_expense_view_form" priority="50">
+
+  <xpath expr="//label[@for='payment_mode']" position="attributes">
+    <attribute name="invisible">True</attribute>
+  </xpath>
+
+  <xpath expr="//div[@id='payment_mode']" position="attributes">
+    <attribute name="invisible">True</attribute>
+  </xpath>
+
+</data>