Nadya,

You can eliminate the weird char errors by putting hte bintoc() value between quotes as in;

    lcFor = iif(vartype(m.tnDsID)="N",;
            [for "] + bintoc(DsID) + ;
            ["+extryear+extrweek="] + bintoc(tnDsID) + ["+lcIssue], ;
            [for State+ExtrYear+ExtrWeek=']+ m.lcStateWeek+['])