Service Call

Hi Friends,

I have Done a Sample Application on this.

I want to know .

What is a service Call?

In that He Has created a service call to BAPI_FLIGHT_GETLIST?

what is the use of a service Call?

Is it Only applicable to predefined Function Modules or else we can create service calls to the function modules created by us .

And I had a problem in my Application.

when i am performing the action My data is not getting populated into the table?

when i am entering the from & TO .

pressing the button.

My data is not being populated.

Please help me.

If u want the screenshot i will mail you u can give ur mail ID.

Please solve my problem