Defining a Value Set

 Hi,

I am creating a concurrent request with three parameters;

1- Document Type ( Blanket, Standard, Release, Requisition )

2- Document Number

This value is depending upon previous select of document type. If it is Standard it should display only Standard PO and so on.

But if it is Requistion it selects data from a different table.

3- Third parameter is Release Number this depends upon previous two selection.

I have following two questions;

a- Can I use two different tables in a value set and select data from them depending upon conditions ? If yes, How ?

b- How can I refer values from Parameter Form in my Value Set ?