OK, well the person asking you to abandon the mission is from another system, so your target is likely to be one of these three: pirates, traders or bounty-hunters.
Drop in to the nav beacon at LHS 3447 and kill a few pirates (or bundle in with the sysauth ships killing wanteds). If the bugged target is pirates, killing two of them might complete the mission. Once yo have a ship in your sights and it starts scanning it, look at the ship allegiance in the display on the left of the scanner - Union of LTT18486 Confederacy ships are the target. Make sure they're wanted before you engage, or the sysauth ships will turn on you sharpish.
You have the requisite two posts now, so you can post images. Use the links on the right of the image in Imgur (or at the bottom, where it says "get image links") and find the BBCode links.