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MS Project Duration Summary Task not adding up

Anonymous
2012-02-10T00:38:35+00:00

I have created a project using the Standard calendar as my base in Project Information. All tasks are effort driven, resource calendar also based on Standard calendar in Change Working Time. Confirmed Standard calendar as default in Tools\Options.

I inserted a column in the Gantt view for Task Calendar and all entries are showing as None.

I have inserted a column for Work, which is adding up fine.

I have also inserted a column for Duration which is not adding up at summary task level. Also, if I change the duration of a task, the Gantt chart is retaining the original value.

I think this must be related to calendars but I cannot see how to sort this out. Your help would be much appreciated.

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John Project 49,710 Reputation points Volunteer Moderator
2012-02-10T02:17:32+00:00

LindaAB,

The Duration field does not "add" up. Duration for a summary line is the difference in working time between the start of the earliest subtask and the finish of the latest subtask under it.

Does that clarify things?

John

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  1. Anonymous
    2012-02-14T09:27:02+00:00

    Duration and Work must be summed up in the all cases for summary tasks based on their sub tasks and predecessor relationships. So, if your summary tasks duration are not being updated, this may come form the project's calculation mode: perhaps it is set to manual.

    Go to Tools > Options > Calculation tab and select Automatic.

    Also, for the latest version of MS project, 2010, summary task values can be set separately from its sub task, if its mode is set to manual, no matter whether the entire project is calculated automatically or manually.

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  2. Anonymous
    2017-08-21T16:05:27+00:00

    Hi All ,

    In order to get a correct task summary duration : you must define a new calender by setting up everyday as a work day ( and working hours should be same with what you entered at options > schedule > {default start time} , {default end time} ) for the summary tasks only not the activities.

    Thats how i solved my problem.

    Good luck !

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  3. Anonymous
    2015-04-29T18:14:02+00:00

    I just had this and finally figured out that the summary task needed to have the same special calendar applied to it as the subtasks do - they were in conflict.

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  4. Anonymous
    2012-04-11T14:05:57+00:00

    Hi,

    Are the summary tasks "automatically scheduled"?

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