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I have no idea what flags of this nature are used, though I'm pretty sure there are ones for the various statuses which prevent particular transactions. I have no idea how hard it would be to set up a flag such as I mentioned. For your purpose, the better use would be a table storing the player IDs for those made into coaches, and the game has to check the table for a duplicate before making a coach out of a particular retired player.
Though I am not a programmer.
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