Before Record added - error - duplicate records

Hi,
ASP 7.2
I am trying to add this in the Before Record Added

Master table: Registrations

ID - autonumber

ProjectID - text
'** Check if specific record exists ****

dim rsExists

set dal_table=dal.Table("Registrations")

set rsExists = dal.table.Query("ProjectID='" & values("ProjectID") & "'","")

if not rsExists.eof then

' if record exists do something

Flush_output

BeforeAdd=false

message = "This ProjectID (" & values("ProjectID") & ") is used already"

else

' if dont exist do something else

BeforeAdd=true

end if

rsExists.Close : set rsExists = Nothing
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If I use this code I get this error:

This error (HTTP 500 Internal Server Error) means that the website you are visiting had a server problem which prevented the webpage from displaying.

Is there a problem in my code: When I check the syntax = no errors.



If I simply erase this code - my application works perfectly
---------------------------------------------------------
this code used to work in version 6.2
I suspect the problem can be here???

set rsExists = dal.table.Query("ProjectID='" & values("ProjectID") & "'","")

The ASP manual suggests:
set rsExists = dal.table.Query("AnyColumn='" & values("AnyValue") & "'","")
Thanks