Recalled - Not to Report
Before a player on Optional Assignment to the minors can be traded or Designated for Assignment, he must be recalled from his minor league assignment ("Recalled - Not to Report").
If a player who was "Recalled - Not to Report" is claimed off waivers while on the Designated List and either the waivers are irrevocable (Outright Assignment Waivers) or the player's club elects not to withdraw a revocable waiver request, the player is assigned to the claiming club.
A player acquired off waivers after being "Recalled - Not to Report" who is subsequently optioned to the minors by his new club must remain in the minors for a minimum of ten days (unless he is recalled to replace a player on the 25-man roster who is placed on the Disabled List, Bereavement List, Paternity List, etc, or the player's minor league season is over, or the player gets traded).
If a player is traded after being "Recalled - Not to Report" and then is optioned to the minors by his new club within 24 hours after the trade, the player can be recalled prior to spending ten days on optional assignment to the minors.
A player who is "Recalled - Not to Report" for the purpose of being Designated for Assignment accrues MLB Service Time equal to the number of days he is on the Designated List prior to being traded, released, or sent outright to the minors.