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using dates within Rules

I'm trying to write a rule check a date range but I get this error:
null and 12/01/2004 cannot be used with the LESS_THAN operator

This is the expression I'm using:
(SCRCONDATE lt "12/01/2004")
Can someone help with how dates should be used in rules?

Michael Rees
Computer Programmer/Analyst
Maryland Medical Research Institute, Inc.
600 Wyndhurst Ave.
Baltimore, MD 21210

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