Still strange you are getting differing results each time.
Try just adding the one table for now, when you add the subreport the main report doesn't need the other table. It could be some weird table linking the DB drivers are doing causing this.... What happens if you don't link the tables then CR will try to link every field with every field in a DS.
The majority of the assemblies needed are in this list:
using CrystalDecisions.CrystalReports.Engine;
using CrystalDecisions.Shared;
using CrystalDecisions.ReportAppServer;
using CrystalDecisions.ReportAppServer.ClientDoc;
using CrystalDecisions.ReportAppServer.Controllers;
using CrystalDecisions.ReportAppServer.ReportDefModel;
using CrystalDecisions.ReportAppServer.CommonControls;
using CrystalDecisions.ReportAppServer.CommLayer;
using CrystalDecisions.ReportAppServer.CommonObjectModel;
using CrystalDecisions.ReportAppServer.ObjectFactory;
using CrystalDecisions.ReportAppServer.Prompting;
using System.Data.OleDb;
using CrystalDecisions.ReportAppServer.DataSetConversion;
using CrystalDecisions.ReportAppServer.DataDefModel;
using CrystalDecisions.ReportSource;
Add them all then you should find it all...
Don