diff --git a/src/views/invoice/Detail.jsx b/src/views/invoice/Detail.jsx
index f6a2e9a..cd1e539 100644
--- a/src/views/invoice/Detail.jsx
+++ b/src/views/invoice/Detail.jsx
@@ -264,7 +264,14 @@ function Detail() {
 													]}>
 													<Select placeholder="Select Currency type" onChange={onCurrencyChange} options={bindCurrency()}></Select>
 												</Form.Item>
-												<Form.Item name="info_date" label="Due Month">
+												<Form.Item name="info_date" label="Due Month"
+													rules={[
+														{
+															required:true,
+															message:"please select Due Month!",
+														},
+													]}
+												>
 													<DatePicker picker="month" />													
 												</Form.Item>												
 												<Text type="secondary">Payment is arranged during the last week of each month. If the invoice is issued after the 20th, please select the following month for payment. For urgent payments, please contact the travel advisor. </Text>