[RESOLVED] Simple Criteria Expression?

[lilmark]

Using access 2000.

I created a query in design mode and have two tables linked by acct number. I have all the fields from both tables listed below in the field columns.

I added two addition caluclated fields.

Funding Date: DateAdd("yyyy",1,[FundDate]) 'this adds a year to the date
Date Diff: DateDiff("d",[ExpireDate],[Funding Date]) 'displays the difference in days between the two dates

On the criteria for Date Diff I put... >= 60 .... so it will display any record which has expired 60 or more days before the Funding Date.

However, when I try to run the query it asks me to enter the Parameter Value for Funding Date. Why? If I run the query without the criteria it shows them all no problem, but as soon as I use the criteria I get that message. Am I over looking something?