Ok, it seems that cProjects really is unable to work with task durations less than 1 day. This means I can't, for example, schedule a meeting with a client in the morning (half day) and a subsequent report-development in the evening based on the meetings information (another half day) with a relationship of finish-start between these tasks.
I have to make them parallel tasks of 1 day in duration each, and here I lose precedence relationship between them. When I work in a project with 2 to 4 tasks a day, this becomes a major problem for scheduling and task relationship management. I have to know how many less-than-1-day tasks I can squeeze inside 1 day and group them as parallel tasks so I can keep them at the same calendar-day and get a realistic project schedule.
Just as an example. In picture 1 we see a 9 day project with 9 tasks, which I found at Wikipedia. In cProjects I get a 11 day project if I keep the precedence relationship between the tasks because I can't get tasks smaller than 1 day in duration, as seen in picture 2. To get a realistic schedule, one would have to loosen the relationships to squeeze tasks into the same calendar-day, as seen in picture 3.
Picture 1: [http://upload.wikimedia.org/wikipedia/en/6/65/Screengrab_-_Microsoft_Project_9.0.2000.0224_-_%28simple_Gantt_chart%29_.png]
Picture 2: [http://69.60.122.62/~mutex/Wikipedia_cProjects1.JPG]
Picture 3: [http://69.60.122.62/~mutex/Wikipedia_cProjects3.JPG]
The process of loosen relationships to squeeze tasks into its correct time frame can get complicated when you have a project with some 400 tasks and an estimated execution time of 6 month. But if you don't do so, you probably will get a larger project schedule than needed.
In my oppinion this is a major design flaw. I wonder why SAP hasn't changed that in the upcomming cProjects 4.5. Maybe I am the only one having real trouble with that.
Thanks you all for the help!
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