Microsoft Access 2007 continuous form - refer to value in previous row

I need to have a field in a continuous form use a value from the previous row.

Using the "Order" field and the first Start Date  I need the rest of the "Start" fields to fill in.
The first "Start" and "End" fields are calculations in the underlying query.

The remaining starts field values (in order) would use  "End" + 1

Order      Start            End

1      2/17/14            2/22/14
2      2/23/14
3            

I have attached an example db.   The Project Form has a subform on it that shows tasks.  That is where I need the help.
ML-Test.accdb
mlaurinAsked:
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GozrehConnect With a Mentor Commented:
Your Startdate should be =[Required_Start]+Nz(DSum("[T_Aggressive_duration]","Tasks_tbl","Project_ID=" & [Tasks_tbl]![Project_ID] & " AND Order<" & [Order]),1)

and the enddate =[Required_Start]+DSum("[T_Aggressive_duration]","Tasks_tbl","Project_ID=" & [Tasks_tbl]![Project_ID] & " AND Order<=" & [Order])
ML-Test.accdb
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Jim Dettman (Microsoft MVP/ EE MVE)President / OwnerCommented:
For something a little more generic, you may want to look at this:

How to fill a record with data from a previous record automatically in Access 2000 and 2002 and Office Access 2003
http://support.microsoft.com/kb/210236

also along the same lines, and closer to you question, is the code below.

Jim.

Function GetPreviousRow(frm As Form, strFieldName As String)

        ' Fetches value of field from previous row
       
        Dim strBM As String
        Dim rstClone As Recordset

        ' Get the bookmark for the current row.
10      strBM = frm.Bookmark

        ' Now create the record set clone, and make it
        ' refer to the same row as rst, which is on the same
        ' row as the form.
20      Set rstClone = frm.RecordsetClone.Clone()
30      rstClone.Bookmark = strBM

        ' Move the clone record set to the previous row.
        ' If this puts us at the BOF, then the result has to be
        ' FALSE, and leave the function.
40      rstClone.MovePrevious
50      If rstClone.BOF Then
60        GetPreviousRow = False
70      Else
          ' If you're not at BOF, then retrieve the necessary info.
80        GetPreviousRow = (frm.RecordsetClone(strFieldName) = rstClone(strFieldName))
90      End If

100     rstClone.Close

End Function
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