関連ワード:  hsn code mandatory in invoice    hsn code mandatory in invoice notification    hsn code required in invoice    hsn code mandatory in gst invoice    hs code mandatory in bill of lading    is hsn code mandatory in tax invoice    whether hsn code is mandatory in invoice    is hsn code mandatory in export invoice    hsn code is not required in invoice when turnover is less than    hsn code mandatory for b2c invoices