Importing Project's General Info tab data

Hi folks,

I'm trying to import some attribute data to project's general info tab using the core Import functionality of an 9.3.3 Agile instance.

I can sucessfully import Category attributes, General Info.description, General Info.Estimated Star Date, General Info.Estimated End Date, but I can't import atttributes like: General Info.Percent Complete, General Info.Actual Start Date and General Info.Actual End Date.
The Import/Export Guide shows that it would be possible to Import P1, P2 and P3 attribute Data, I'm assuming that P1 is the General Info tab.

By the way, I created the projects using a DataLoad application like app.