Usually Progress' sales resp will try to talk you into the following: The number of licenses for the AppServer and the database it connects to must be equal.
Therefore be aware when talking to your Progress sales rep.
This is an excellent point and it cannot be emphasized enough.
Before your start any negotiations with a Progress sales rep -- or a partner rep (or any commission based sales person) first obtain the relevant pricing and policy guide. Refuse to speak to them about *anything* until you have a copy of the guide and you have read it.
If you start "discussions" (which are really negotiations, no matter how friendly you may think the rep is) before you have read the policy guide then you are doomed. It will not help you to read it later -- once they have a few sizing "sound bites" from you and send you a quote it will be like getting a UN Treaty through the US Senate to get anything better. The rep's management will feel like they have to backup their rep's hallucination because the sales revenue will have been forecast all the way up the ladder and everyone is on the hook for it. Everyone's comp numbers are based off that initial quote -- it can never go down, only up. They will twist and turn every which way to convince you that whatever bizarre fantasy pricing scheme they came up with is real and necessary. If they don't do that then the regional sales manager won't be able to afford their second yacht...
Defend yourself. Get the policy guide first and ask lots of questions about different scenarios. Do NOT ever suggest what you think might be a "worst case" scenario to them -- that will quickly become the base quote and you will then find out what a true worst case looks like. If you really feel like you must talk about "worst case" scenarios couch them as hypothetical "5 years from now" options and frequently reference other directions that you might have to consider if the pricing is not extremely favorable.
For what it is worth -- I have nothing against paying fair and equitable license costs. We're all trying to make money. But I have seen far too many cases where commission based sales people have completely and utterly abused defenseless customers.
One more thing -- while you're reviewing the license terms... have your legal team strike the change of control clause. The one where if your company gets sold or changes its name the sales guy comes back and tells you that you have to "relicense" everything (that means pay for it again as if it is brand-new).