SSRS Expression

I'm stumped.  
[ContMax] =IIF(Fields!TradeAmount.Value>Fields!MTA.Value,0,Fields!TradeAmount.Value)

Details
MTA is based on a parameter (= 6500 in this case) @MaxTradeAmt
TradeAmount is from transactions for various accounts.
If TradeAmount > parameter MTA the it should be set to 0 and add up with any other tradeamounts for the [Year] (my column head).

Results
Inconsistent.  What I find is if more than one TradeAmount in a given year is greater that 6500 I get an Error.
If I only have 1 TradeAmount that exceeds 6500 the result is accurately shown as 0.
Anytime all TradeAmounts are less less that 6500 they Sum correctly.

Any thoughts would be appreciated.
ShawnGrayAsked:
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Russell FoxDatabase DeveloperCommented:
You can directly reference the parameter value in the field expression:
= IIF(Fields!TradeAmount.Value > Parameters!MaxTradeAmt.Value,
	0,
	Fields!TradeAmount.Value
)

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ShawnGrayAuthor Commented:
Russell, Thank you!  This was driving me nuts.
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Russell FoxDatabase DeveloperCommented:
We aim to please!
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