Feature Request: Negative Purchase Orders

Our company is in the HVAC service and installation industry (similar accounting needs to construction) using Quickbooks Enterprise Desktop Contractor edition.  It meets many of our needs reasonably well, but is lacking in one, which is allowing negative purchase orders for returns.  This is a very common requirement in these industries, and all of the more industry specific (and unfortunately significantly more expensive) software will have that feature.  We will have 50-100 returns of materials unused on jobs per month, and now we have to create a $0 purchase order that we hold as a flag that we are waiting for the credit invoice, then when the credit comes in we have to manually make the PO inactive and enter the credit invoice manually (instead of having it pull from the PO).  This is very cumbersome, and it seems like it would be an easy fix to simply allow negative line items on a PO and allow the credit invoice to pull from it the same way the positive ones do.