[news.eclipse.birt] Aggregate time series charting help

[Rob Scott <rob@xxxxxxxxxxxxxxxxxx>]

This might be more of a reporting question than a BIRT question, I am not 
sure.

What I have is a set of data that consists of a date and a count.
Imagine it to be the amount of a certain product sold on that date.
What I want is a bar chart of the total amount of that product sold each 
month.

Does BIRT do this for me? 

What I have managed so far is to get something like that except for 
months when there is no entry, i.e. no product was sold during that 
month, then it seems to me that no place for a bar shows up.
In my mind it should show up with a scale make of zero above it.

Is this correct? Am I doing something wrong? Or do I have to make sure 
that there is a count for each month even if it is 0?