actor appearing twice in cast list under two different names

I remember dealing with this issue in the past, and did receive an answer, but that was such a long time ago and things may have changed in how to handle the situation.

The issue is how to deal with one actor appearing in the cast list under two different names in two different positions. The situation in question is for Man on the Moon, the cast list which I have just updated. Jim Carrey appears in the number 1 position in the role of Andy Kaufman. He also appears in the number 28 position under the name actor name "Tony Clifton" in the role of Tony Clifton. I know how to handle the numbering and the character naming, but previously there was an attribute "also as" which no longer seems to be valid. Solely using the attribute "as Tony Clifton" is not accurate because the role of Andy Kaufman for which he is credited under his IMDb display name Jim Carrey would be negated. In making my recent update, I have left the attribute field blank which does not deal with the problem.