Unowned prospects that did not hit AA or higher in the previous year cannot be added to MLB rosters on Yahoo, even if they hit AA, unless they are called up to the big leagues.
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Prospects may not be promoted to the MLB roster until they have played at least one game at AA or higher. Similarly, free agent prospects may not be added to a MLB man roster until they have played at AA or higher. (Note: This rule is intended to prevent issues arising from owning players in the low minors added to the database by Yahoo.)