Change delivery document print format

Has anyone been able to alter the format/content of the delivery document (PO Receipt document)? It currently includes the bar code for tracking number, along with requesting location info, inventory location info, and deliver to info, along with line, item nbr,delivery qty, etc.  We want to add some more fields to this doc but are not sure where the format would be changed. From the MSCM Admin Guide, we see reference to the labelconfig.xml file and have taken a look at that file. Any ideas?