# Keyframing constraints overwrite

I have a objectA, and when I add a copy location constraint to it to another objectB with influence 0 at frame 10 and then add keyframe. Then on frame 11 I change the influence to 1 and add a keyframe, but when I go back to any frame from 1-10 I find that the influence is 1 as if it overwrote the inserted first keyframe which was inserted when the influence was 0. Any advice please?

To keyframe the influence value of the copy location constraint: