diff --git a/erp/sale/product.go b/erp/sale/product.go
index ec8effd..cf741a0 100644
--- a/erp/sale/product.go
+++ b/erp/sale/product.go
@@ -117,6 +117,7 @@ type ProductItem struct {
 	QuoteStartNum      int64            `json:"quoteStartNum"`
 	QuoteMeasureUnit   string           `json:"quoteMeasureUnit"`
 	OuterNum           *int64           `json:"outerNum"`
+	MinusTaxRate       *decimal.Decimal `json:"minusTaxRate"`
 	Currency           string           `json:"currency"`
 	CurrencyName       string           `json:"currencyName"`
 	CurrencySymbol     string           `json:"currencySymbol"`