Attunity Oracle Source - select with a parameter

Hello,
I have verified the good performances of the Attunity Oracle Source component and for this reason I would like to use it.

The problem is that the query I have to execute needs a parameter.
Indeed I am using this Data Flow inside a Loop.

Is there a way to use a query with a parameter?
Is it possible to keep the sql from a variable that is changed dinamically?
Is it possible to keep the sql from a file that contains the sql ?
Does a workaround exist?

Thanks

Antonio