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If a project is put on hold, will the resources be freed?
Once again, Celoxis does not automatically free up any resources. However, you can filter the RLC to show all resources in the given time period, who are working on tasks in projects that are On Hold . (Project : Phase : On Hold). Since you know that project is on hold, potentially all that allocation you see on the chart is freed up and you can choose to assign those resources to your tasks.
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