Why when I search a date-time field, it report : operators are not supported in text field

HCL Domino Domino Forum
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after:Call doc.CopyItem(docOrg.GetFirstItem(“DraftDate”,“ReleaseDate”)

then search :[ReleaseDate]>2004-03-10

it will report:operators are not supported in text field.

But the type of field ReleaseDate is date-time, and if I change "ReleaseDate" as an another name, the result is ture. Why? It's so strang.
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Subject: Why when I search a date-time field, it report : operators are not supported in text field

Any luck with this? I am running into a same issue. Adding [Form}] contains “Form Name” eliminates the error but does not allow the FTsearch to find it. I manually try to search on the offending field and it doesn’t see it as a date/time field and only gives me contains as an option.