Ranting after many light years (oops that's a unit of distance)

Damn Damn Damn.

There is complex workflow engine, and the only thing I know is once you fix and get success response from method A(), call method B().

After 2 days and nights effort, method A() is fixed and I am getting success response.

Now, when I pass this response to B()

One data is missing and hence failing.

Where the hell is that data getting kicked out...

I am in a dead end. I don't even know where to look.
Pinged engineers for help but all in vain till now.

Working on one of world's largest system, and I am miserable in debugging with this system.

And the worst part is there is nothing that I can turn off and on so that it works.

(Don't blame me. I am not that dumb. I just started using it since 3 days)