Threshold Chart in BIRT 3.7.2

biplanet

Dears,

I'm new to BIRT, I have a requirement from customer to create availability bar chart with threshold, i know that i can create markers on Y-Axis, so it will looks like a threshold at value 98%.

But, the problem is the customer requested bar colour under the threshold line to be green and above the threshold is red.

How can i achieve that using birt???

I tried to make 2 series using stacked bar chart style but not effective.

Please see the attached picture to know the requirement.

what i want