Spreading the blame....

I'm just a tad upset at the moment, and maybe I shouldn't be but I'm going to vent anyway. Day has been going pretty well. Found out an order a couple weeks ago go screwed up and that someone is going to get in trouble for it.....looked like blame was going to go to another guy at work since it was his day on and was the only supervisor here. I felt bad because it really stinks to get in trouble around here. We were suppose to ship certain rolls on a certain shipment and several of these rolls somehow did not get shipped. Not good. Well come to find out, the blame is being spread (by my manager) and hopefully in a way that doesn't directly say "Sarah is the one who messed up". I kind of shrugged my shoulders and just said "oh well...not much I can do about it now" but the more I think about it the more upset I am getting that blame is also being put on me. I missed the same thing the supervisor did and ultimately it is his responsibility...not mine (am I a supervisor? no, don't think so)...and yet I'm going to get in trouble too. Oh well. Guess I should just sigh and try to forget about it. I should have stepped it up...maybe it was my fault.