I was scheduled for a double d/h trip 26 Dec thru 6 Jan with a line check on the last two operating legs. I have just been advised via a crew notification that the trip was revised. It now ends on 31 Dec but they added a trip 4-6 Jan and have me scheduled for the line check on the latter trip. They have me listed for the trip as M/U. Seems like they are trying to pull a fast one. Is this kosher?