[Zope] dtml-sqltest

The following string in a ZSQL method will not include any where clause. What is wrong? The MktSectorID field occurs in both tables so I need to specify it with the dot notation. Could that be it? If I remove the optional, I get the same result. SELECT tblProjData.projnumb, tblProjData.projname, tblProjPhase.ProjIsActive, tblProjMktSector.projtype, tblProjData.MktSectorID FROM (tblProjData INNER JOIN tblProjMktSector ON tblProjData.MktSectorId = tblProjMktSector.MktSectorID) INNER JOIN tblProjPhase ON tblProjData.ProjPhaseID = tblProjPhase.StatusID <dtml-sqlgroup where> <dtml-sqltest tblProjData.MktSectorID type="int" op="eq" optional> </dtml-sqlgroup> ORDER BY tblProjData.projnumb;