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Fix Project Plan 3 Resource Calendar Exceptions Not Working

Khadija KhanKhadija Khan Oct 14, 2026 870 views

Question details

The user needs to ensure that task durations automatically adjust and extend when a designated resource has absent days recorded in their calendar.

How to Fix Project Plan 3 Resource Calendar Exceptions Not Updating Task Durations
Product
Microsoft Project Plan 3
Device & OS
not provided
Scenario
Tracking project timelines and managing task durations based on assigned resource availability and vacation time.
Observed behavior
Tasks assigned to an absent resource maintain their original duration (e.g., 21 days) instead of extending to account for the absence (e.g., 30 days), despite automatic scheduling being enabled.
Before you start

Ensure that your Project schedule tasks are set to 'Auto Scheduled' and verify that you have administrative rights to edit the shared resource pool if your projects are connected to one.

Solution 1Recommended

Configure Shared Resource Pool and Calendar Precedence

This solution ensures holidays and vacations are added to the correct resource calendar and that the shared resource pool overrides local project calendars.

When using a shared resource pool in Microsoft Project, conflicts can occur between the local project calendar and the central resource calendar. Setting the proper precedence forces the task to respect the resource's documented absences.

1
Open Resource Calendar

Navigate to the 'Project' tab on the ribbon and click on 'Change Working Time'.

2
Verify Exceptions

Select the specific resource from the 'For calendar' dropdown menu and ensure their vacation days are correctly listed in the 'Exceptions' tab.

3
Check Resource Pool Settings

Go to the 'Resource' tab, click 'Resource Pool' in the Assignments group, and select 'Share Resources'.

4
Set Pool Precedence

In the Share Resources dialog box, look under the conflict resolution settings and ensure 'Pool takes precedence' is selected, then click 'OK'.

Configure Shared Resource Pool and Calendar Precedence
Check Task Types: If the task duration still does not change, double-click the task to open Task Information, go to the Advanced tab, and ensure the Task Type is not set to 'Fixed Duration'.
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Frequently Asked Questions

Why does my task duration not change when I add a vacation day to a resource?

This usually happens if the task is configured as 'Fixed Duration'. To fix this, right-click the specific task, open 'Task Information', navigate to the 'Advanced' tab, and change the task type to 'Fixed Work' or 'Fixed Units'.

How do I apply a company-wide holiday in Project Plan 3?

Go to the 'Project' tab and select 'Change Working Time'. Select the Standard Project Calendar, go to the 'Exceptions' tab, and enter the holiday dates. Make sure all individual resource calendars are based on this Standard calendar.

What does 'Pool takes precedence' mean in Microsoft Project?

When sharing resources across multiple project files, 'Pool takes precedence' dictates that the working times, holidays, and exceptions defined in the central resource pool file will override any conflicting local project calendar settings.