I thought it was anything over 100k. Of course, we don't know how the system works so it could be an assignment or it could be like trading commodities so a slider is produced that displays how many CXP we transfer.
Per a discussion with Heretic if you have at least 130k in a category you can do the mission (it turns in 30K CXP for Fleet Marks, so at 130K you don't drop below the 100K mark). Supposedly you can't fail the mission but you can Crit it. All this was based on a discussion with him, but he didn't have the actual numbers in front of him at the time (and since he left things are subject to change I suppose). I still want to know how to get them though, he said something about DOFF Contacts on the starbases giving them, but that it wasn't the DOFF Contact mentioned in the T5 starbase info.