On my team, I wanted to let the "drafted" pitchers shake out a while before swapping one of the "reliever" or "bench" pitchers in for the starters. I wanted to drop in 1980 Mark Fidrych from the "Reserve" position in place of 1932 Freddie Fitzsimmons. At first, I tried to drop Fitzsimmons in as a reliever (real stats: 35 G/31GS), and move a pitcher currently in "relief" to the "reserve" role. I got an error message saying "invalid role". So, I just wanted to swap in Fidrych in place of Fitzsimmons directly, moving Fitzsimmons to the "Reserve" spot. STILL got an "invalid role" message. Fidrych's real 1980 stats are 9 G, 9 GS, so I can't imagine that's the problem... Any ideas why it won't let me plop him in as a starter?
It looks like the problem is with Aaron Sele. He started all 18 of his games in 1993 so he isn't eligible to be a reliever. I'm not sure how that happened. There may have been a bug when you drafted and hasn't been noticed until you tried to change your rotation.