Delphi Master, Detail, Sub Detail

Don't understand why this would not work?

JobList Master Source

        JobScheduleList Master Source
      Job# -> Job#

            Job# -> Job#
            Schedule# - > Schedule#

            This errors Table JobList does not have field Schedule#
Greg RowlandSoftware Designer, SysDBA, WebMaster OwnerAsked:
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Greg RowlandSoftware Designer, SysDBA, WebMaster OwnerAuthor Commented:
Solved this with;

procedure TScheduleJobf.wwtSchedListAfterScroll(DataSet: TDataSet);
  tSched.Filter := 'SchedNo = ' + wwtSchedList.FieldByName('SchedNo').Text;
  tSched.Filtered := True;

Works fine, though I still wonder why the previous approach wouldn't work?
Sinisa VukSoftware architectCommented:
Sometimes even Delphi components have a bugs...

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Greg RowlandSoftware Designer, SysDBA, WebMaster OwnerAuthor Commented:
No solution found, queried my way out of it, using client datasets.
Greg RowlandSoftware Designer, SysDBA, WebMaster OwnerAuthor Commented:
When in doubt, brute force;p
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