Interbase cannot accept multi value parameters with ?
It can use
WHERE sl.Truck_Nbr IN ("A205", "A206") but not WHERE sl.Truck_Nbr IN (?)
.
I have tried using
="""" & (Join(Parameters!Parameter3.Value,""",""")) & """"
in the parameter expression and if I display the value on the report, it does display, "A205", "A206" and the interbase query does not complain but it does not return any records