You are correct. User::WEBfeWBPhaseID is Int32. I changed the parameter mapping to be LONG but the same error comes up.

The query I've been trying (extremely simple for now) is this:

DECLARE @WEBfeWBPhaseID as int

SET @WEBfeWBPhaseID = ?

UPDATE tbl_WRPhase

SET MonitorAlert = 'Yes'

WHERE WEBfeWBPhaseID = @WEBfeWBPhaseID

Once I get it working, the query will be more complicated.