Binding between task and method is not visible

Hi,

Hope everybody is doing good. I havea  question on workflow binding which I could not find the answer while searching. In one of our custom workflow for Non PO invoice document approval & post, there is a background task which posts the document. In this, i am not able to see any binding between the task and method. But the data are getting passed correctly from workflow to task and task to method & vice versa.

I checked the same in WF definition and logs of  DEV, QUAL & PROD systems. It is a currently running workflow without having any binding issue. How come it is possible? Am i missing anything to see the binding?

BO: FIPP
Method: POST

Thanks
Rajee