Need clarification while using WE19 tool

Dear All,

I have gone through the forums and Blogs but still I am not convinced and need your inputs.

Scenario is IDOC to File .

In we19,We have Sender and Recipient information to be filled in EDIDC record.

1.The sender Partner # and Partner Type is mandatory. Why sender port information is not mandatory? If not mandatory will the system take any default value?

2.If it takes the default value,the Port information will be taken from R/3 or XI system?

2. In Receiver Information for the Port, Partner# and Partner Type, We need to give the configured names from R/3 or XI system and need clarifiaction for the same for Sender Information also.

Please provide your inputs.

Regards

B.Dheepa