Go to setting-->>template->>select template to required setting->>Edit->>item table->>click on Customize Item Name & Description->>${INVOICE.Item.CF.Shade.Value}-->>click on save
Go to setting > template > select template to required setting>Edit>item table>click on Customize Item Name & Description> ${INVOICE.Item.CF.Shade Code.Value}->>select >click onsave
Select the Invoice that is to be creat e-way bill-->edited the wrong HSN code in the item and invoice-->Save the invoice-->and create again e-way bill.