From the manual
Quote:
In OOTP, each player accumulates three types of service time:
Professional service time
Major league service time
Time on the secondary roster (only available if you have minor leagues)
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http://manuals.ootpdevelopments.com/...e=service_time
Taking the player off the major league roster will stop them from accruing major league service time, it will not stop them from accruing the other two types