data class B2bTaxInvoiceItem(val purchaseDate: String? = null, val name: String? = null, val spec: String? = null, val quantity: Long? = null, val quantityScale: Int? = null, val unitCostAmount: Long? = null, val unitCostAmountScale: Int? = null, val supplyCostAmount: Long? = null, val taxAmount: Long? = null, val remark: String? = null)