You can call the LA Sheriff's Office and check for sure. But, from what I understand, it means that the inmate has his prison packet and is ready to be transported to state prison. Once he is actually transported it will be SP4.
The prison packet is prepared by the court clerk. It contains the pre sentence (or post sentence) report, the transcript of the sentencing hearing and the abstract of judgment. I think the "both Abstact" reference is to the fact that the inmate is being sent to state prison on two matters.
Having said that -- this is off the top of my head and a call to the Sheriff should get you a definitive answer.