diff --git a/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.js b/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.js
index ac5f5dd..8d4d2d4 100644
--- a/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.js
+++ b/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.js
@@ -372,3 +372,22 @@
 		frm.toggle_reqd("supplier_warehouse", frm.doc.is_subcontracted==="Yes");
 	}
 })
+
+frappe.ui.form.on("Purchase Invoice", {
+	payment_terms_template: function() {
+		cur_frm.trigger("disable_due_date");
+	},
+
+	disable_due_date: function() {
+		const disable = !cur_frm.doc.payment_terms_template && cur_frm.doc.payment_schedule.length == 0;
+		cur_frm.set_df_property("due_date", "read_only", disable ? 1 : 0);
+	},
+
+});
+
+frappe.ui.form.on("Payment Schedule", {
+	payment_schedule_remove: function() {
+		cur_frm.trigger("disable_due_date");
+	},
+
+});
\ No newline at end of file
diff --git a/erpnext/accounts/doctype/sales_invoice/sales_invoice.js b/erpnext/accounts/doctype/sales_invoice/sales_invoice.js
index ef233c6..2c11e17 100644
--- a/erpnext/accounts/doctype/sales_invoice/sales_invoice.js
+++ b/erpnext/accounts/doctype/sales_invoice/sales_invoice.js
@@ -564,3 +564,22 @@
 
 	refresh_field('total_billing_amount')
 }
+
+frappe.ui.form.on("Sales Invoice", {
+	payment_terms_template: function() {
+		cur_frm.trigger("disable_due_date");
+	},
+
+	disable_due_date: function() {
+		const disable = !cur_frm.doc.payment_terms_template && cur_frm.doc.payment_schedule.length == 0;
+		cur_frm.set_df_property("due_date", "read_only", disable ? 1 : 0);
+	},
+
+});
+
+frappe.ui.form.on("Payment Schedule", {
+	payment_schedule_remove: function() {
+		cur_frm.trigger("disable_due_date");
+	},
+
+});
\ No newline at end of file