diff --git a/src/pages/products/components/UpdateVariant.tsx b/src/pages/products/components/UpdateVariant.tsx
index 1e94ffa..fe5d9f4 100644
--- a/src/pages/products/components/UpdateVariant.tsx
+++ b/src/pages/products/components/UpdateVariant.tsx
@@ -14,7 +14,7 @@ import type { FieldInputProps } from 'formik'
 import * as Yup from 'yup'
 
 interface FormikFieldProps {
-    field: FieldInputProps<string | number>
+    field: FieldInputProps<string | number | undefined>
     form: { values: { discount_type: string } }
 }
 
@@ -58,20 +58,26 @@ const UpdateVariant: FC<UpdateVariantProps> = ({ variant, onUpdate }) => {
         specialSale_endDate: Yup.string()
     })
 
-    const initialValues = useMemo(() => ({
-        retailPrice: variantData?.results?.productVariant?.price?.retailPrice?.toString() || '',
-        order_limit: variantData?.results?.productVariant?.price?.order_limit?.toString() || '',
-        sellerSpecialCode: variantData?.results?.productVariant?.sellerSpecialCode,
-        stock: variantData?.results?.productVariant?.stock?.toString() || '',
-        discount_type: '',
-        discount_value: variantData?.results?.productVariant?.price?.discount_percent?.toString() || '',
-        specialSale_order_limit: variantData?.results?.productVariant?.price?.specialSale_order_limit?.toString() || '',
-        specialSale_quantity: variantData?.results?.productVariant?.price?.specialSale_quantity?.toString() || '',
-        specialSale_endDate: variantData?.results?.productVariant?.price?.specialSale_endDate || ''
-    }), [variantData])
+    const initialValues = useMemo(() => {
+        const discountPercent = variantData?.results?.productVariant?.price?.discount_percent
+        const hasDiscount = discountPercent !== undefined && discountPercent !== null && Number(discountPercent) > 0
+        return {
+            retailPrice: variantData?.results?.productVariant?.price?.retailPrice?.toString() || '',
+            order_limit: variantData?.results?.productVariant?.price?.order_limit?.toString() || '',
+            sellerSpecialCode: variantData?.results?.productVariant?.sellerSpecialCode,
+            stock: variantData?.results?.productVariant?.stock?.toString() || '',
+            discount_type: hasDiscount ? 'percent' : '',
+            discount_value: hasDiscount ? Number(discountPercent) : undefined,
+            specialSale_order_limit: variantData?.results?.productVariant?.price?.specialSale_order_limit?.toString() || '',
+            specialSale_quantity: variantData?.results?.productVariant?.price?.specialSale_quantity?.toString() || '',
+            specialSale_endDate: variantData?.results?.productVariant?.price?.specialSale_endDate || ''
+        }
+    }, [variantData])
 
     const handleSubmit = (values: typeof initialValues) => {
-        const discountValue = parseFloat(values.discount_value as string) || 0
+        const discountValue = typeof values.discount_value === 'number'
+            ? values.discount_value
+            : (values.discount_value ? parseFloat(values.discount_value as string) || 0 : 0)
 
         const baseData = {
             productId: id!,
@@ -243,8 +249,12 @@ const UpdateVariant: FC<UpdateVariantProps> = ({ variant, onUpdate }) => {
                                                     label={form.values.discount_type === 'percent' ? 'درصد تخفیف (%)' : 'مقدار تخفیف (تومان)'}
                                                     placeholder={form.values.discount_type === 'percent' ? 'مثال: 10' : 'مثال: 50000'}
                                                     type="number"
-                                                    value={field.value}
-                                                    onChange={(e: React.ChangeEvent<HTMLInputElement>) => setFieldValue('discount_value', e.target.value)}
+                                                    value={field.value !== undefined && field.value !== null ? String(field.value) : ''}
+                                                    onChange={(e: React.ChangeEvent<HTMLInputElement>) => {
+                                                        const value = e.target.value
+                                                        const numValue = value === '' ? undefined : Number(value)
+                                                        setFieldValue('discount_value', isNaN(numValue as number) ? undefined : numValue)
+                                                    }}
                                                 />
                                             )}
                                         </Field>
diff --git a/src/pages/products/types/Types.ts b/src/pages/products/types/Types.ts
index d559929..7f4619f 100644
--- a/src/pages/products/types/Types.ts
+++ b/src/pages/products/types/Types.ts
@@ -241,6 +241,7 @@ export type ProductVariantDetailType = {
   product_status: string;
   isFreeShip: boolean;
   isWholeSale: boolean;
+  saleFormat: SaleFormatType;
   size?: SizeType;
   color?: ColorType;
   meterage?: MeterageType;
@@ -250,8 +251,7 @@ export type GetProductVariantsResponseType = {
   status: number;
   success: boolean;
   results: {
-    count: number;
-    productVariants: ProductVariantDetailType[];
+    productVariant: ProductVariantDetailType;
   };
 };