This is a pretty basic feature that Shipstation offers.  It allows me to run reports on Drop ship orders for example so that I can send those to my vendors to automatically create orders.

It also makes it easier for me to do some order Analysis.  Right now, I have had to pay the minimum shipstation fee just so I could keep access to those types of reports.

I know it has been mentioned before, but it is starting to become a deal breaker for me.  I really like Shipping Easy and especially like the direction you are going, but this is something that would better appeal to people like me that came from shipstation.  Not saying everything has to be exactly like them, but they do have a much better work flow.  I like  your inventory system, but it is also lacking reporting, especially on POs.