Projected Sub...

[RKBUmp]

Would you allow this? Baker is playing Flex. Jones is Playing DP. In their defensive half of the inning, the coach comes out to you and tells you Jones will start playing Defense for Smith. Smith mad about this yells at the coach. The coach comes back out and tells you that Brown is replacing Smith.
It has no immediate impact on the game since Brown and Smith will continue to occupy their same seats on the bench, but it is an immediate substitution.

If Im following this correctly, you dont have anything to record and there has been no substitutions. The DP can play defense for anyone, except the flex and it is not a substitution. The only times the coach really needs to inform you of the DP playing a defensive position is when they are the pitcher or catcher for courtesy runner purposes, and if they do play defense for the flex, because then you do have a substitution.