Show Invoice URL Link and Amount for Records Between Dates

[#1]

I'm building a table that pulls the Amounts and Invoices for records between two dates based on their Service Date.  However, if I get the correct rows pulled the Invoice Links don't show.  If I get the Invoice Links to show all the records for the particular Vendor are pulled with the Amounts outside the Date Range as zeros.  What's the Invoice Link code that will show only those invoices during that timeframe?

Thanks,

Mindy

Attempt #1

Date Range = 4/1/13 - 7/1/13

Expressions:

Invoice Link   =if({$<[Service_Date]={'>=$(vStartDate) <=$(vEndDate)'}>}[Invoice_No] & '<url>' & [Invoice_Link])

Amount        =Sum({$<[Service_Date]={'>=$(vStartDate) <=$(vEndDate)'}>}Net_Act_Amt)

Project	AFE#	Invoice Link	Vendor	Service Date	Amount
BBDF 53H	121560	-	Smith & Taylor, Inc	4/2/13	250,000
BBDF 54H	121572	-	Smith & Taylor, Inc	5/23/13	5,900
BBDF 60H	121211	-	Smith & Taylor, Inc	6/15/13	275,327
BBDF 65H	131672	-	Smith & Taylor, Inc	6/29/13	33,185
BBDF 71H	131674	-	Smith & Taylor, Inc	7/1/13	125

Attempt #2.

Date Range = 4/1/13 - 7/1/13

Expressions:

Invoice Link   =[Invoice_No] & '<url>' & [Invoice_Link]

Amount        =Sum({$<[Service_Date]={'>=$(vStartDate) <=$(vEndDate)'}>}Net_Act_Amt)

Project	AFE#	Invoice Link	Vendor	Service Date	Amount
BBDF 20H	121212	16074	Smith & Taylor, Inc	12/16/12	0
BBDF 37H	121378	16070	Smith & Taylor, Inc	1/30/13	0
BBDF 53H	121560	16084	Smith & Taylor, Inc	4/2/13	250,000
BBDF 54H	121572	16138	Smith & Taylor, Inc	5/23/13	5,900
BBDF 60H	121211	16097	Smith & Taylor, Inc	6/15/13	275,327
BBDF 65H	131672	16095	Smith & Taylor, Inc	6/29/13	33,185