Hi Jerry,
The simple example should provide you with the necessary requisite. All what you need to do is to
create your own extract structure and assign that as type for the table parameter e_t_data.
Now you will get the selection criteria, as well as the fields selected in the datasource from the 2 incoming tables. You need to write the necessary abap code to execute a query and populate your extract struture.
Once important peculiarity of this function module is that it is called several times, or as many times as the MAX parameter + 1. ie, once for each row fetched. Hence you will find a persistence method of using a CURSOR with HOLD property to retain the data between the function calls.
The help in generic datasource explains the 3 modes,
initialize, first call and the repeat call for the
function module. The simple function module example actually provides the necessary logic to deal with these modes and the example uses the sflight table.
Hope that is some information that could help u begin with.
Anoop C M
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