I dont think he understood what you where meaning, unless I didnt understand you.... you upgraded 1/3 legs and now have no credits left, so the system wont let you upgrade the other 2/3. Happened to me before, just call the desk and they will upgrade the other ones for you, if of course no additional credits are needed. IE yow-yyz-yvr is 10 (now 6) but if you upgrade yyz-yvr first, let it confirm, and have 0 credits, you cant upgrade yow-yyz as you have no credits even tho it is free, 10+0 credits.