Crystal Reports 10 Formula Issue?

[blakemckenna]

I have a CR 10 report in which it takes a Date Parameter. This parameter is defined Where "Allow multiple values" is checked and "Discrete and Range Values" is selected.

I'm not sure if my Record Selection criteria is correct for this Parameter. Here is what the Record Selection looks like.

{AR_OpenInvoice.InvoiceType} = "FC" and
{AR_OpenInvoice.CustomerNo} = {?CustNo} and
{AR_OpenInvoice.InvoiceDate} = {?InvoiceDate}

The highlighted line doesn't seem to be working. Basically, the query is not returning a range of records between the 2 date parameters and I don't think I have that highlighted line set up right but not sure how to construct it. The image below is how I have setup my Parameter. Any ideas?

Thanks,