VB5 Crystal Reports

Hello, Im pretty new to reporting, I would appreciate a lot your help, I have this scenario:

I have VB5 with Crystal Reports for Visual Basic (I think its version 4.6.1.0), and I call a report from my program with this lines:

VB Code:

CrystalReport1.ReportFileName = CurDir + "\ticket_ent.rpt"
CrystalReport1.SelectionFormula = "{ticket_ent.key_e}=" + combo_ppticket.Text
CrystalReport1.Action = 1

Now, this works ok, but I need to add a DB field to the report. What I did was to modify the report directly in Crystal but when I ran the app that particular field didnt print at all, so Im guessing its something related to "SelectionFormula" but I just dont know where to start. Any ideas, thanks.