Can birt's scatter plot correctly render two points having the same x-values?

Migrateduser

I am trying to make a plot of two points having the following coordinates:
p1=(5,+20)
p2=(5,-20)

Normally, I would use scatter plot (excel, matlab etc) and these tools would render two points correctly (ie one point is below another and a vertical line could be drawn between these two points)

However, I am having some serious difficulties doing the same in BIRT. I choose my dataset of two points, choose the scatter plot, ungroup anything along the a-axis. However, the Birt just spreads same valued x coordinates across the x-axis and does not appear to render two points at the right coordinates.

Is there any trick to getting true scatter plot in Birt or scatter plot is an impossibility within Birt?

Thanks,

1st chart is from excel (scatter plot)
2nd chart is from birt (scatter plot)