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

Please see previous post:

Great solution with a little snag because I did not supply enough information.

It works with one project, however there will be multiple projects so the tasks will need to be grouped by project.

Can the following be altered to somehow say "grouped by project id"?
[Required_Start]+Nz(DSum("[T_Aggressive_duration]","qryTasks","Order<" & [Order]),1)
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GozrehConnect With a Mentor Commented:
I changed it also there, (maybe after you sow it - you should refresh the screen)

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])
I also attached there your sample with this code in the qryTasks,  i'm sorry for the in-convinces.
you can delete this question if you want.
mlaurinAuthor Commented:
Thank you, quick and perfect solution!
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