diff --git a/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py b/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py
index 0dd716d..a9e8fbc 100644
--- a/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py
+++ b/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py
@@ -46,6 +46,7 @@
 		}]
 
 	def onload(self):
+		super(PurchaseInvoice, self).onload()
 		supplier_tds = frappe.db.get_value("Supplier", self.supplier, "tax_withholding_category")
 		self.set_onload("supplier_tds", supplier_tds)