Display Method

Hello,

I'm working on a display Method that is supposed to call the field Qty (Quantity) from the table InventTrans and display it on a report called InventDimPosted. Here is the Method:

Display Qty QtyPhy()
{
InventTrans inventTrans;

Select Qty From InventTrans Where InventTrans.ItemId == InventSum.ItemId;
Return QtyPhy();
}

Now my problem is that there is an error message on it telling me that: "The Method has not been declared." I don't understand what's going on.