diff --git a/erpnext/accounts/doctype/payment_request/payment_request.py b/erpnext/accounts/doctype/payment_request/payment_request.py
index 1570b49..2c96749 100644
--- a/erpnext/accounts/doctype/payment_request/payment_request.py
+++ b/erpnext/accounts/doctype/payment_request/payment_request.py
@@ -549,3 +549,11 @@
 	}, target_doc, set_missing_values)
 
 	return doclist
+
+def validate_payment(doc, method=""):
+	if not frappe.db.has_column(doc.reference_doctype, 'status'):
+		return
+
+	status = frappe.db.get_value(doc.reference_doctype, doc.reference_docname, 'status')
+	if status == 'Paid':
+		frappe.throw(_("The Payment Request {0} is already paid, cannot process payment twice").format(doc.reference_docname))
\ No newline at end of file
diff --git a/erpnext/hooks.py b/erpnext/hooks.py
index 53f40bc..2f7e930 100644
--- a/erpnext/hooks.py
+++ b/erpnext/hooks.py
@@ -317,6 +317,9 @@
 	},
 	"Company": {
 		"on_trash": "erpnext.regional.india.utils.delete_gst_settings_for_company"
+	},
+	"Integration Request": {
+		"validate": "erpnext.accounts.doctype.payment_request.payment_request.validate_payment"
 	}
 }