In BUSY, you need to mention port details in export and SEZ sales invoice in order to generate e way bill. You can follow these steps to update it.
Step 1: Go to administration section then click on sales voucher and click on add tab.
Step 2: Now, Create the invoice with required details like party name, item details, sales type etc.
Step 4: While save the invoice, you will get export shipping bill details in which you have to click on update port address and specify the port details in it.
Step 4: After update the port details, save the invoice.