If you don't like X++, simply use SharePoint search. Graphically, drag and drop your way to a query for purchase orders. Then, publish the query to SharePoint.
From there, you can use search operators till your heart is content.
But to get your Dynamics AX into search appropriately, here are the steps:
Skip all of the post and go to the end:
"High level fix it steps until next Dynamics Ax blog post, Part 3E".. Look at step 1
I'm going to change the entire series and make it more compressed after I'm done so that part of the post probably won't be there in the future. However, for now, you can see how to add a query to search.
Now, just find any one of several different query tutorial blogs on the internet to build a query. Than, you can search for purchase orders in the sharepoint search bar using keyword query operators (if using sharepoint 2010)..
msdn.microsoft.com/.../ee558911(v=office.14).aspx
That will get you what you need.