Ax 2012 aif catching warnings

Question

I created an AIF web service in ax. I have a vb.net application that calls the aif web service to insert data into the general journal. Now when an error occurs i catch it in vb and it returns the error which is fine. What i want to do is also catch the warning messages. Usually what happens , is if a line is getting entered and its a wrong dimension, it returns a warning message and an error. but i only get the error. So the question is how can i either catch and retrieve the warning message in ax along with the error and return it to my application. Basically need to get it from the exception list in ax.