When doing a MSP Import:

MS Project files maintains dates even for a manually scheduled tasks. These dates are silently computed by MSP to indicate the dates as if the tasks are auto-scheduled.The MPP/XML file has these dates and are used Celoxis. These tasks will be imported as manually scheduled tasks in Celoxis.

When doing a MSP Export:

Celoxis' manually scheduled tasks will be exported as manually scheduled tasks into MSP.
Summary tasks will be exported as auto-scheduled tasks.

Manually scheduled tasks will always be imported and exported with Schedule Type as 'Fixed Duration'. Schedule Type will not factor or change the manually scheduled task dates.

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