I've never understood the purchasing of software. Let's say you want to purchase Adobe Acrobat 9 and you've never bought a previous version. The purchase order is going to ask you to define the Major Version from your managed software. What do you select? Do you wait until the software arrives, scan it on someone's system, mark it as managed, and only then can you properly create the PO and define the major version?

How do you guys handle this?