diff --git a/erp/shipment/customs.go b/erp/shipment/customs.go
index 9950472..2138499 100644
--- a/erp/shipment/customs.go
+++ b/erp/shipment/customs.go
@@ -34,7 +34,7 @@ type CustomsItem struct {
 	InvoiceSerial    string     `json:"invoiceSerial"`
 	CustomsNo        string     `json:"customsNo"`
 	ContractDate     *time.Time `json:"contractDate"`
-	InvoiceDate      time.Time  `json:"invoiceDate"`
+	InvoiceDate      *time.Time `json:"invoiceDate"`
 	CustomName       string     `json:"customName"`
 	CustomShortName  string     `json:"customShortName"`
 	EstSailingDate   *time.Time `json:"estSailingDate"`
diff --git a/erp/shipment/exchangeSettlement.go b/erp/shipment/exchangeSettlement.go
index f102072..56bd7bf 100644
--- a/erp/shipment/exchangeSettlement.go
+++ b/erp/shipment/exchangeSettlement.go
@@ -33,7 +33,7 @@ type ExchangeSettlementItem struct {
 	InvoiceSerial        string     `json:"invoiceSerial"`
 	ExchangeSettlementNo string     `json:"exchangeSettlementNo"`
 	ContractDate         *time.Time `json:"contractDate"`
-	InvoiceDate          time.Time  `json:"invoiceDate"`
+	InvoiceDate          *time.Time `json:"invoiceDate"`
 	CustomName           string     `json:"customName"`
 	CustomShortName      string     `json:"customShortName"`
 	EstSailingDate       *time.Time `json:"estSailingDate"`
@@ -61,7 +61,7 @@ type ReplyExchangeSettlementInfo struct {
 	ExchangeSettlementNo string     `json:"exchangeSettlementNo"`
 	ShipmentId           int64      `json:"shipmentId"`
 	EstSailingDate       *time.Time `json:"estSailingDate"`
-	InvoiceDate          time.Time  `json:"invoiceDate"`
+	InvoiceDate          *time.Time `json:"invoiceDate"`
 	ReadyDate            *time.Time `json:"readyDate"`
 	ShipPort             string     `json:"shipPort"`
 	DischargePort        string     `json:"dischargePort"`
diff --git a/erp/shipment/serial.go b/erp/shipment/serial.go
index 96f4db5..ac48a84 100644
--- a/erp/shipment/serial.go
+++ b/erp/shipment/serial.go
@@ -34,7 +34,7 @@ type SerialItem struct {
 	InvoiceSerial    string     `json:"invoiceSerial"`
 	SerialNo         string     `json:"serialNo"`
 	ContractDate     *time.Time `json:"contractDate"`
-	InvoiceDate      time.Time  `json:"invoiceDate"`
+	InvoiceDate      *time.Time `json:"invoiceDate"`
 	CustomName       string     `json:"customName"`
 	CustomShortName  string     `json:"customShortName"`
 	EstSailingDate   *time.Time `json:"estSailingDate"`