adding fields to the cube

hi gurus,

i have a cube named zsalesorder which is in support project,the data is loading from r/3 to bw side,now my client wants to have 2 fields add to this cube,when i add the 2 info objects in the infocube the data for those feilds appear to be blank as it was in support the data was there for the remaing fields.how can i populate those 2 fields to my cube?

what is the use of the option make infoobject as data target is this useful in my scenario.

Thanks in advance