How to create a new line for an existing sales order using web services
We have a requirement where we need to update a sales order by creating a new line. i.e i have created a sales order with two lines line#:1, line#:2 using web services that is successfully created in SaaS and it went to PROCESSING status. After creating, I want to create another line with line#:3 using web services for the same existing sales order.
Any help on how to achieve this?